Hayward ProSeries Sand Filter Inground 30 In Side Mount
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Hayward ProSeries W3S310S 30-Inch Side-Mount Sand Filter Tank for In-Ground Pools
The W3S310S is the 30-inch ProSeries side-mount filter tank for in-ground pools. It uses the same tank body, 500 lb sand charge, 4.91 sq ft of filtration area, and 98 GPM flow rating as the W3S310T2 top-mount model, but the valve connection is at the side of the tank rather than the top. This lowers the overall installation height, making it the right choice for equipment rooms or pad configurations where a top-mount valve at the 30-inch tank's full height would conflict with overhead clearance.
Because no valve ships with the W3S310S, buyers need to select and source a compatible valve separately. Confirm port size, valve type (multiport vs. slide), and plumbing configuration with your pool equipment supplier or installer before ordering the tank.
Hayward W3S310S ProSeries 30-Inch Side-Mount Sand Filter Key Features
- Side-mount valve connection - Reduces total installation height compared to the W3S310T2 top-mount, suited to low-clearance equipment rooms and installations where overhead space is limited at the 30-inch tank scale.
- 30-inch tank with 4.91 sq ft of filtration area - 500 lbs of sand, 98 GPM flow ceiling, and the longest backwash intervals in the ProSeries lineup at equivalent pool sizes.
- Valve not included - The tank ships ready for a side-mount valve installation. Select a compatible Hayward multiport or slide valve with the correct port size for your plumbing before ordering.
- 360-degree self-cleaning laterals - Full-flow slotted design for balanced, energy-efficient backwashing across the full 30-inch tank base.
- Integral top diffuser - Even water distribution across the full sand surface for maximum use of the 4.91 sq ft filtration area.
- Corrosion-proof reinforced thermoplastic tank - Durable all-weather construction for permanent outdoor in-ground pool installations.
- Large pressure sand/water drain - Full-size base drain for manageable seasonal draining and sand changes at this larger tank size.
Hayward W3S310S ProSeries 30-Inch Side-Mount Sand Filter Specifications
Sand not included. Valve not included. Use #20 grade silica pool filter sand only.
Hayward ProSeries In-Ground Sand Filter Lineup: W3S310S in Context
| Model | Tank | Mount | Sand | Flow Rate | Valve |
|---|---|---|---|---|---|
| W3S210T | 21 in. | Top | 200 lbs | 44 GPM | 1.5" included |
| W3S210S | 21 in. | Side | 200 lbs | 44 GPM | 1.5" included |
| W3S220T | 22 in. | Top | 250 lbs | 52 GPM | 1.5" included |
| W3S244T | 24 in. | Top | 300 lbs | 62 GPM | 1.5" included |
| W3S244T2 | 24 in. | Top | 300 lbs | 62 GPM | 2" included |
| W3S270T | 27 in. | Top | 350 lbs | 75 GPM | 1.5" included |
| W3S270T2 | 27 in. | Top | 350 lbs | 75 GPM | 2" included |
| W3S310T2 | 30 in. | Top | 500 lbs | 98 GPM | 2" included |
| W3S310S (this model) | 30 in. | Side | 500 lbs | 98 GPM | Not included |
Flow rates per Hayward published specifications. The W3S310S is the only model in this lineup that does not ship with a valve.
Maintaining the Hayward W3S310S ProSeries 30-Inch Side-Mount Sand Filter
Backwash procedure depends on the valve installed. Generally: backwash when pressure rises 8 to 10 PSI above the clean baseline, run until the sight glass (on the valve) clears, Rinse for 15 to 30 seconds, then return to Filter. At 500 lbs of sand, backwash intervals will be among the longest at this pool size range. Replace sand every 3 to 5 years.
First Startup: Loading Sand
Fill the tank halfway with water before adding sand. Add 500 lbs of #20 silica sand in gradual, even portions. Run a Rinse cycle before switching to Filter to clear fine dust. Record the post-Rinse pressure as the clean baseline.
Winterizing the W3S310S
Backwash thoroughly before shutdown. Drain the tank through the base drain and leave the plug out. Drain and winterize the valve per the valve manufacturer's instructions. In hard-freeze climates, blow out the valve and confirm complete drainage before any hard freeze.
Hayward W3S310S ProSeries 30-Inch Side-Mount Sand Filter Frequently Asked Questions
Why doesn't the W3S310S include a valve?
At the 30-inch side-mount configuration, Hayward ships the tank separately to allow installers to select the appropriate valve type (multiport or slide) and port size for the specific plumbing layout. This gives more flexibility for custom installations, equipment room configurations, and replacement scenarios where an existing valve may be reused. If you want a complete ready-to-plumb 30-inch system with the valve included, the W3S310T2 top-mount includes a 2-inch Vari-Flo valve.
What valve do I need for the W3S310S?
You will need a compatible Hayward side-mount multiport or slide valve sized for the tank's port. Confirm port size and valve type with your pool equipment supplier or installer before ordering. At 98 GPM, a 2-inch valve is appropriate to minimize head loss through the valve body.
What is the difference between the W3S310S and W3S310T2?
Same 30-inch tank, 500 lbs of sand, 98 GPM flow rate. The W3S310T2 is a top-mount configuration with the 2-inch Vari-Flo valve included. The W3S310S is a side-mount configuration without a valve. Choose the W3S310S when your installation requires side-mount plumbing, when you are supplying your own valve, or when overhead clearance rules out a top-mount configuration at this tank height.
Does the W3S310S include sand?
No. 500 lbs of #20 silica pool filter sand must be purchased separately. Add sand in gradual portions and fill the tank halfway with water first to protect the lateral assembly.