Revised Section 225119 - Aquatic Filtration System.pdf

SECTION 225119 - AQUATIC FILTRATION SYSTEM H2M

HEMV2502 225119 - 1 Issue Date: JULY 2026

07-27-2026 12:26:46 PM

PART 1 - GENERAL

1.01 SCOPE OF WORK

A. It is the intent of this specification to describe a water filtration system complete with all necessary items. It is the further intent of these specifications that the filtration unit from the pump through the backwash system, including all filter control valves as hereinafter specified, and all accessories, be supplied and guaranteed by one manufacturer. Any filter offered under these specifications shall be NSF listed at the time of offering (bid date). Such listing shall be evidenced by the filter model number appearing in the current NSF listing for swimming pool filters at the filtration rate required for this project.

B. Under this section, the Contractor shall furnish all necessary materials, labor and equipment as specified herein and/or as shown on the plans for the installation of filtration equipment for the main pool, interactive pool and wading pool.

C. The filter specified shall be of the pressure sand type. The filter shall be a product of a manufacturer regularly engaged in the fabrication of water filtration equipment and who has a minimum of five (5) years experience in manufacturing this type of filter.

1.02 RELATED WORK SPECIFIED ELSEWHERE

A. Section 099744 - Mechanical Piping Coating Systems B. Section 130111 - Special Conditions for Aquatic Work C. Section 225113 - Aquatic Recirculation Piping D. Section 225116 - Aquatic Pumps

1.03 QUALITY ASSURANCE

A. Use adequate numbers of skilled workers who are thoroughly trained and experienced in the necessary crafts and are completely familiar with the Specified requirements and the methods needed for proper performance of the Work of this Section.

B. Tanks shall have label specifying size, filter area, serial number, maximum flow rate and NSF seal and ASME seal.

C. Standards:

1. Unless otherwise indicated herein, perform work in accordance with the following standards:

a. New York State Swimming Pool Code

b. US Swimming Rules and Regulations, 1993 edition

c. New York State Sanitary Code, Part 6

d. ACI 347

e. Governmental agencies having jurisdiction

2. In the event of conflict between or among specified requirements and pertinent regulations, the more stringent requirements will govern.

D. Inspection

1. Check all equipment for proper catalog numbers, size, type and quantity.

2. Ascertain that all component parts have been delivered and that hardware is complete.

3. Inspect surfaces for mars and damages; repair or replace, as directed by the Engineer.

4. Reject and return all defective equipment.

1.04 SUBMITTALS

A. Product Data

1. Within thirty five (35) calendar days after the Contractor has received Town’s Notice to Proceed, submit:

a. Manufacturer’s data, shop drawings and installation instructions for propriety materials.

1.05 PRODUCT HANDLING

A. Initial Inspection

HEMV2502 225119 - 2 Issue Date: JULY 2026

1. Tanks shall be inspected immediately upon delivery. The following shall be causes for rejection:

a. Open tank and check for any damage (scratches, cuts, etc.)

b. Damage to flanges or threads. Tanks shall be shipped with ¾” wood flange protectors.

All threaded connections shall be plugged. Manhole covers shall be in place and shipped with an extra set of gaskets.

B. Damage to Painted Surfaces

1. Where scratched or damaged, area shall be cleaned, rust removed and surface reprimed.

2. Where tank has been dented or otherwise abused, it shall be called to the attention of the

Engineer who shall determine whether or not the tank is to be rejected or removed from the site.

C. Storage

1. Store tank in clean, dry area.

2. Protect from weather

3. Protect from mechanical damage.

D. Check for installation of NSF seals. If these are not found, the tank shall be immediately rejected and removed from the site. Advise Engineer of such occurrence.

E. Protect equipment from construction operation and weather. Do not leave equipment in areas subject to vandalism.

F. Replace damaged equipment

1.06 WARRANTIES

A. Filter tanks shall carry a fifteen (15) year fully rated warranty as regularly offered by the tank manufacturer.

B. Internal and external face piping shall carry a fully rated three (3) year warranty.

C. Valve bodies shall carry a five (5) year fully rated warranty.

D. Valve operators and system accessories including sight glass, pressure gauges and air relief valve shall carry one year warranty as provided by the product manufacturer.

E. Unless otherwise specified, workmanship is to be guaranteed first class and carry a one (1) year warranty.

PART 2 - PRODUCTS

2.01 FILTER SYSTEM REQUIREMENTS

A. The filter system shall be supplied complete by the manufacturer and shall include: internals, face piping and valves, gauge panel with tubing and petcocks, sight glass, air relief connection, bottom drain connection with internal strainer.

B. System shall be fabricated and fully assembled at the manufacturer’s plant for pressure testing and dimensional verification. System shall be knocked down for shipping purposes in subassemblies for minimum field assembly. Internal manifold and lateral piping shall be factory installed and shipped in place.

2.02 FILTER SYSTEM CAPACITY

A. Competition Pool: The filter system shall consist of (1) filter tank with a total effective area of 41.6 square feet. Filtration rate shall not exceed 15 gallons per square foot of filter area. System flowrate shall be 624 gpm in order to turn over a capacity of 206,252 gallons within a 6 hour turnover period. System shall be Mer-Made Filter Model 160-109.

B. Family Pool: The filter system shall consist of (1) filter tank with a total effective area of 16.2 square feet. Filtration rate shall not exceed 15 gallons per square foot of filter area. System flowrate shall be 172 gpm in order to turn over a capacity of 33,660 gallons within an 6 hour turnover period.

System shall be Mer-Made Filter Model 143-56

HEMV2502 225119 - 3 Issue Date: JULY 2026

C. Spray Park: The filter system shall consist of (1) filter tank with a total effective area of 41.6 square feet. Filtration rate shall not exceed 15 gallons per square foot of filter area. System flowrate shall be 500 gpm in order to turn over a capacity of 15000 gallons within a 30 minute turnover period.

System shall be Mer-Made Filter Model 160-109.

2.03 FILTER SYSTEM

A. Fiberglass Filter Tank

1. The equipment described herein shall be products of a manufacturer regularly engaged in the fabrication of pressure vessels for at least 15 years.

2. The filter tank shall be suitable for 50 psi working pressure, hydrostatically tested to 1.1 x working pressure and designed with a 4:1 safety factor.

3. Saddle style bases (2) shall be provided for tank support. Systems which incorporate stacked tanks shall include similar bases and mounting saddles for the upper vessel.

Access to the tank shall be provided by a 14” x 18” manhole with a two bolt, 4 point yoke.

Manhole seal shall be complete with one piece ¼” neoprene gasket and positioned so that internal pressure from the filter will augment the seal. Externally mounted bolt-on covers will not be accepted.

4. Drain out system shall consist of one (1) 3/4" fiberglass coupling mounted to the tank bottom.

Each coupling to be fitted with a slotted PVC sand retainer. Air relief connection shall be one (1) 3/4" coupling provided on top of the tank. Bulkhead fittings will not be accepted.

5. Each filter tank shall be equipped with the necessary flanges and connections for the internal and external piping. Connections shall be comprised of 1" minimum thickness fiberglass flanges with ANSI standard 150 lb. bolt pattern. Connections requiring bolt-thru hardware will not be accepted.

6. The resin used shall be a commercial grade, premium corrosion resistant vinylester that has been evaluated in a laminate by test in accordance with ASTM C-581 in service comparable to the intended service and recommended for this service by the manufacturer. Other generic types of resin such as isophthalics or general purpose polyester resins shall not be acceptable.

7. Ultraviolet absorbers shall be added to the exterior surface for improved exterior resistance.

8. Chopped strand mat shall be constructed from commercial grade E- type glass strands bonded together using a binder. The strands shall be treated with a sizing that is chemically compatible with the resin system used. Continuous roving shall be a commercial grade of E-type glass fiber with a sizing that is chemically compatible with the resin system used.

9. The inner surface exposed to the corrosive environment shall be followed with a layer composed of vinylester resin, reinforced only with non continuous glass fiber strands applied to a minimum thickness of 0.100 inches. The combined thickness of the inner surface and interior layer shall be 0.110 to 0.130 inches and in no case less than 0.100 inches.

10. The exterior laminate shall consist of filament winding and unilateral construction so as to create a modulus of elasticity to maintain no more than 0.1% strain in any direction.

11. Resin used in these layers shall be Hetron 922 incorporating a Cobalt/MEKP cure system as recommended by the manufacturer.

B. Filter Piping - Internal

1. The lower internal distribution system shall be a horizontal header/lateral arrangement. The headers shall be 8" Schedule 80 PVC construction, capped on one end and flanged on the other end. Lateral connections shall be spaced no more than 6" on the centers and shall be 1½" FPT connections

2. Underdrain laterals shall consist of 1½" Schedule 80 PVC pipe with .012” wide machined double slotted openings on 1/8" centers. Machined openings shall be designed to retain all media particles as small as .30 mm particle size. Molded or drilled openings or retainer screens will not be acceptable. Each lateral shall be fabricated complete with a socket cap on one end and male adapter on the other. Both fittings to be solvent welded to the slotted pipe. Laterals shall be fitted with a rubber 0-ring to allow for proper positioning of the machined openings.

HEMV2502 225119 - 4 Issue Date: JULY 2026

3. Overdrain laterals shall consist of 1½" Schedule 80 PVC pipe with 1/2" wide machine slotted openings on 1 1/4" centers. Upper laterals shall be designed and sized at the factory so as to provide uniform distribution and unrestricted flow during filter and backwash cycles.

Laterals shall be fitted wit a rubber 0-ring to allow for proper positioning of the machined openings.

4. All components of the filter shall be factory installed.

5. All hardware in wetted areas shall be T304 stainless steel or non- metallic.

6. Internal piping shall carry a three (3) year warranty.

C. Face Piping

1. Competition Pool: External face piping shall be 6” Schedule 80 PVC pipe and fittings. Flanges shall be located so as to allow for easy dismantling of face piping. All fittings shall be solvent cemented.

2. Family Pool: External face piping shall be 4” Schedule 80 PVC pipe and fittings. Flanges shall be located so as to allow for easy dismantling of face piping. All fittings shall be solvent cemented.

3. Spray Park: External face piping shall be 6” Schedule 80 PVC pipe and fittings. Flanges shall be located so as to allow for easy dismantling of face piping. All fittings shall be solvent cemented.

4. Piping shall be drilled and tapped where necessary to accommodate gauge tubing connectors

5. All valves 3” - 12” shall be constructed with cast aluminum ASTM S12A housing and fully coated with Rilsan on all interior and exterior surfaces. Internal components include EPDM resilient lining, Rilsan coated ductile iron disc and T304 stainless steel shaft. Valves 14” and larger shall be constructed with cast iron housing epoxy coated and with nylon coated ductile iron disc.

6. Standard accessory items shall include sight glass rated for 50 psi with polycarbonate glass, remote mounted gauge panel with two 4½" diameter pressure gauges, ¼" petcocks, ¼" poly vent tubing with PVC compression adapters.

D. Three (3) Way Valve Control Operator

1. A mechanical linkage shall connect two (2) valves in order to create simultaneous movement.

2. Connecting pieces shall vary with the size of facepiping in order to operate with suitable mechanical advantage

3. All linkage parts shall be T304 stainless steel.

4. Linkage shall be designed so that filter and backwash cycles can be accomplished by repositioning a pair of valves.

5. Each pair of valves shall be operated as specified with lever, gear or electric actuation.

6. All linkage components shall be grit blasted to a 1-2 mil profile. Blast media shall be completely non-ferric.

7. All linkage components shall be finish coated with 3-4 mils DFT of Type 316 pigmented stainless steel paint.

E. Valve Operators

1. Lever Operators DominionTM

a. Valves shall be provided with 6 position latch lock handles.

b. Latch lock handles shall be constructed of epoxy coated cast aluminum and shall include a spring loader lever for position lock.

c. Lever shall be capable of holding the disc in any of the locking positions with no movement up to the full pressure rating of the valve.

F. Single Tank Backwash

1. Competition Pool: The backwash system shall be capable of backwashing through sequencing of butterfly valves. Maximum system backwash flow shall be 624 gpm, providing 15 gpm per square foot with a total of 41.6 square feet surface area.

HEMV2502 225119 - 5 Issue Date: JULY 2026

2. Family Pool: The backwash system shall be capable of backwashing through sequencing of butterfly valves. Maximum system backwash flow shall be 189 gpm, providing 15 gpm per square foot with a total of 12.6 square feet surface area per tank.

3. Spray Park: The backwash system shall be capable of backwashing through sequencing of butterfly valves. Maximum system backwash flow shall be 624 gpm, providing 15 gpm per square foot with a total of 41.6 square feet surface area per tank.

G. Automatic Relief Valve

1. A 3/4" valve shall be provided to automatically and continuously release air in the filter. The valve shall be fabricated of GRP with synthetic rubber seals. A plumbing kit shall be provided with two (2) PVC ball valves to allow manual air relief and isolation of the automatic valve. Valves fabricated of cast iron, bronze or stainless steel shall not be acceptable

H. Filter System Packaging

1. All filter piping and valves shall be factory assembled and knocked down into sub-assemblies for shipment.

2. The components shall be carefully packaged in a totally enclosed wooden crate to prevent damage during transport.

I. Media

1. Competition Pool and Spray Park:

a. Sand shall be a carefully selected grade of hard, uniformly graded silica material. Media shall be naturally rounded particles of silica or milled angularly shaped particles of silica quartz. Sand shall have a particle size between .45 mm and .55 mm.(#20). No more than 1.5% shall be allowed to pass through a #40 sieve (.0164”). Uniformity coefficient shall not exceed 1.53. Specific gravity to be not less than 2.5. Filter shall contain a minimum bed depth of 24". Systems which do not provide a minimum 24" bed depth will not be acceptable. Sand shall be delivered and stored in 100 pound bags (approximately one cubic foot) for ease of handling and elimination of possible contamination. Media shall be free from minerals which may precipitate onto pool surfaces.

b. Each filter tank shall be provided with the following:

1) 0.45 - 0.55 sand - 55 cu.ft. per tank

2. Family Pool:

a. Sand shall be a carefully selected grade of hard, uniformly graded silica material. Media shall be naturally rounded particles of silica or milled angularly shaped particles of silica quartz. Sand shall have a particle size between .45 mm and .55 mm.(#20). No more than 1.5% shall be allowed to pass through a #40 sieve (.0164”). Uniformity coefficient shall not exceed 1.53. Specific gravity to be not less than 2.5. Filter shall contain a minimum bed depth of 21". Systems which do not provide a minimum 21" bed depth will not be acceptable. Sand shall be delivered and stored in 100 pound bags (approximately one cubic foot) for ease of handling and elimination of possible contamination. Media shall be free from minerals which may precipitate onto pool surfaces.B.

b. Each filter tank shall be provided with the following:

1) .45 - .55 sand - 22 cu.ft per tank

J. Gauges

1. Each filter shall be supplied with an influent and effluent pressure gauge. The gauges will be mounted in a common gauge holder.

PART 3 - EXECUTION

3.01 GUARANTEE

A. The equipment manufacturer shall guarantee in writing that if the system is operated in accordance with written instructions given to and accepted by the Town it will perform in complete accord with the specifications.

HEMV2502 225119 - 6 Issue Date: JULY 2026

3.02 INSTRUCTIONS

A. The Contractor shall supply complete drawings and printed instructions for the installation and operation of all equipment specified herein and shown on the drawings. A qualified representative of this Contractor or the manufacturer shall visit the site of work after the installation of such equipment has been completed. He shall put all mechanical equipment into operation and shall assist and instruct the Town’s representative in the operation of all such equipment.

3.03 ENGINEERING SERVICES

A. The contractor shall supply the services of a competent and experienced field engineer for a period of at least three (3) days to inspect the completed installation, adjust the automatic controls to the proper set points, place the system in operation, provide operating instructions relative to its care and use. Review all of these procedures and instructions with the Town.

END OF SECTION