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

Does this filter include the valve?

No. The Hayward W3S310S is a side-mount sand filter tank only. The multiport valve is sold separately.

How much sand does this filter require?

This filter requires 500 lbs. of #20 silica pool filter sand.

Is the sand included?

No. Filter sand must be purchased separately.

What valve do I need for this filter?

For 1-1/2" plumbing, use a compatible Hayward SP0710X62 side-mount valve. For 2" plumbing, use a compatible Hayward SP0715X62 side-mount valve.

What is the flow rate?

The Hayward W3S310S has a listed flow rate of 98 GPM.

Is this filter suitable for large residential pools?

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.

How do I clean this filter?

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.

Does this filter include a pressure gauge?

Yes. A pressure gauge is included.