By Hayward Pool Products



Model # W3S310T2

Warranty 1 Year

Alternate Part #'s HAY-05-811, HPPW3S310T2

Product Description

Hayward sand filters are the very latest in pool filter technology. Molded of durable, corrosion-proof polymeric material, they feature attractive, unitized tank construction for years of trouble-free operation with only minimal care. Pro Series sets a new standard for performance, value and dependability. 


  • In-ground pools of all types and sizes
  • In-ground spas--(residential or commercial)
  • Water features--(fish ponds, fountains, water gardens)


  • Flange clamp design allows 360 degree rotation of valve to simplify plumbing
  • Integral top diffuser ensures even distribution of water over the top of the sand media bed. Full-size internal piping provides smooth, free-flowing performance
  • Unitized, corrosion-proof filter tank molded of rugged, colorfast polymeric material for dependable, all-weather performance
  • 6-position Hayward Vari-Flo control valve with easy-to-use lever-action handle lets you dial any of the 6 valve/filter functions. Integral sight glass lets you see when backwash cycle is completed
  • Efficient, multi-lateral underdrain assembly, with 360 degree slotted, self-cleaning laterals, gives totally balanced flow and backwashing
  • Integral molded drain plug for easy draining of tank, without the loss of sand 

Click here for more Hayward Filters

Product Specifications

Plumbing Size:
2 in.
500 lbs.
Flow Rating:
98 GPM
Filtration Area:
4.91 sq. ft.
Valve Location:
Valve Type:
Turnover 8 Hrs.:
47040 gal.
Turnover 10 Hrs.:
58800 gal.
30-1/2 in.
48 in.
Sand Required:
500 lbs.
Filter Type:
Pool Type:
In Ground

?     Asked on 11/1/2014by Roy Way

We have this filter. We are considering switching from chlorine to salt water pool. Will this shorten the life of the pool filter? How many years of service can we expect out of this filter? Thank you.

A  Answered on 11/3/2014 by InyoPools Product Specialist Brian M.

Good afternoon Roy. A salt system will still be a chlorine pool, it just makes it now instead of you adding it to the water. The tank will be fine and not affected any more by the addition of the salt system. The balance of all chemicals is what extends or shortens the life of your equipment.  The tank should last 5-10 years, depending on the environment. The hotter or colder the weather, the harder it is on the tank material.  

?     Asked on 4/23/2015by John Mac

Could you be so kind as to suggest whether a HAYWARD S310 TOP MOUNT FILTER would be suitable for a :- 13000-15000 galls water 2" plumbing & would it maintain enough pressure for the pop-up cleaners Thanks

A  Answered on 4/24/2015 by InyoPools Product Specialist Robert M.

Hello John - The S310T2 would be suitable for your pool. The pop-up heads are dependent upon the HP of the pump. The S310T2 will have no effect on the pop-up heads.

?     Asked on 6/2/2015by Inyo Visitor

I need a decal for the top of selector value am having hard time finding one. I ask where i get my pool supplies and i was told to write hayward.

A  Answered on 6/4/2015 by InyoPools Product Specialist Patrick P.

Yes we do carry this Hayward Filter Valve Label here.

?     Asked on 6/13/2015by Inyo Visitor

My tank split at the seam. is it possible to purchase a tank only?

A  Answered on 6/13/2015 by InyoPools Product Specialist Alex V.

Hello, It will be cheaper to replace the tank as a whole vs buying the tank by itself.

?     Asked on 6/27/2015by Ron

My in-ground pool holds approximately 18,000 gallons of water. What size sand filter do I need for this size pool?

A  Answered on 6/27/2015 by InyoPools Product Specialist Hector F.

There are multiple different ways that you can go with this size pool. You need to be sure that the pump model that you have has a compatible gallons per minute rating to the filter. Generally speaking without knowing the pump model or system specifications to confirm, you may want to look to use a sand filter that is approximately 3 to 3.5 sq. ft. Please review all system specifications with us or a licensed contactor to confirm that all elements of the system are compatible.


Est. Repair Time

2 to 4 hrs

Tools Needed

Screwdriver, Pliers, Adjustable Wrench

I had to replace my sand filter tank as the old one cracked at the top neck

Written on 6/12/2018 by Craig B.

I my situation I was upgrading my filter size due to a number of reasons. The new filter was a top mount valve where as my old one was side mounted so I had to redo most of the plumbing. The intake line still met up with the Superpump intake but the rest of the plumbing was re worked. After removing the old system I placed the new sand filter in place and made sure the plumbing connections and routes of lines would line up ok. I then added the sand to the filter as per the included instructions which were very simple but helpful so as to not damage the internals of the filter. After that it was a case of tackling one line after another. I like to use unions on all lines in case in the future I need to change out or remove the valve for some reason. I also winterize my pool even though I am in South Carolina by removing, flushing my pump, and then storing it indoors. The unions make that task much simpler and faster. I like to dry fit most of the plumbing so as to have everything lined up correctly before cementing the joints. I find it is easier and makes for less corrections. Once all the connections were complete I added water to prime the pump and started it up. This unions are also helpful, if placed in the proper places for correcting for any leaks.

Were these instructions helpful? 


Review Summary

 (Average 5  out of 5 stars)
3 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Recent Reviews