Product Overview

The Hayward ProSeries 30" Sand Filter Side Mount W3S310S is a high-capacity residential sand filter designed for powerful, dependable pool water filtration. Built with a rugged, corrosion-proof polymeric tank and a side-mount configuration, this filter is ideal for larger in-ground pool systems that require strong flow performance and reliable water clarity.

The 30-inch tank provides increased filtration area and sand capacity, helping trap dirt, debris, and fine particles as pool water passes through the sand bed. Its internal diffuser and precision-engineered self-cleaning lateral system support smooth water distribution, balanced flow, and efficient backwashing.

Important: This model is the filter tank only and does not include the side-mount multiport valve. A compatible Hayward side-mount valve must be purchased separately.

Ideal For

Residential in-ground swimming pools

Larger pool systems requiring a 30" sand filter

Pool owners upgrading to a high-capacity side-mount filter

Systems needing a side-mount valve configuration

Replacement for Hayward S310S / W3S310S style filters

Key Features

30" High-Capacity Sand Filter Tank: The large 30-inch tank provides strong filtration capacity for larger residential pool systems and helps maintain clean, clear pool water.

Side-Mount Design: The side-mount configuration is designed for use with compatible Hayward side-mount multiport valves, giving installers flexibility based on plumbing size and system requirements.

Durable Corrosion-Proof Construction: The unitized filter tank is molded from rugged, colorfast polymeric material for dependable outdoor performance and long service life.

Large 500 lb Sand Capacity: With a 500 lb sand capacity, this filter provides a deep media bed for effective dirt and debris capture.

Even Water Distribution: The integral top diffuser distributes water evenly over the sand bed for consistent filtration and improved performance.

Self-Cleaning Lateral System: Precision-engineered umbrella-fold laterals provide balanced water flow and efficient backwashing while helping simplify service.

Convenient Top Inspection Cover: The durable flanged inspection cover provides convenient access to the top of the filter for service and maintenance.

Easy Winterizing and Service: A large pressure sand and water drain helps make draining, servicing, and winter preparation faster and easier.

Benefits

The Hayward W3S310S is a strong choice for pool owners who need a larger, dependable sand filter for residential pool systems. Sand filtration is simple to operate, easy to backwash, and requires less hands-on cleaning than many cartridge filter systems.

With its 30" tank, 4.91 sq. ft. filtration area, 98 GPM flow rate, and 500 lb sand capacity, this model is built for high-capacity pool filtration when properly matched with the pump, plumbing, and valve.

Specifications

Compatible Valve Options

Compatible side-mount valve selection depends on the pool system plumbing size.

What’s Included

• Hayward W3S310S 30" ProSeries side-mount sand filter tank
• Filter base
• Internal lateral assembly
• Pressure gauge

Side-mount multiport valve is not included.

Pool filter sand is not included.

Customer-Facing Q&A

Q: Does this filter include the valve?
A: No. The Hayward W3S310S is a side-mount sand filter tank only. The multiport valve is sold separately.

Q: How much sand does this filter require?
A: This filter requires 500 lbs. of #20 silica pool filter sand.

Q: Is the sand included?
A: No. Filter sand must be purchased separately.

Q: What valve do I need for this filter?
A: For 1-1/2" plumbing, use a compatible Hayward SP0710X62 side-mount valve. For 2" plumbing, use a compatible Hayward SP0715X62 side-mount valve.

Q: What is the flow rate?
A: The Hayward W3S310S has a listed flow rate of 98 GPM.

Q: Is this filter suitable for large residential pools?
A: Yes. The 30" tank, 500 lb sand capacity, and 4.91 sq. ft. filtration area make it a strong option for larger residential pool systems when properly matched with the pump and plumbing.

Q: How do I clean this filter?
A: Cleaning is done by backwashing through a compatible side-mount multiport valve. Backwash when the pressure gauge rises approximately 8–10 PSI above the clean starting pressure.

Q: Does this filter include a pressure gauge?
A: Yes. A pressure gauge is included.