By Hayward Pool Products



Model # W3S310T2

Warranty 1 Year

Alternate Part #'s 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.

?     Asked on 5/16/2021by Inyo Visitor

We have a 20x40 inground pool. 3' shallow 8'deep end. We need a new filter and do not know what size we need? Thank you Louie

A  Answered on 5/19/2021 by InyoPools Product Specialist Patrick P.

Hi, This would be the perfect sized filter for a 20' x 40' pool and would be the model we suggest.

?     Asked on 5/28/2020by Pat Foster

I just need the tank for a Hayward Sand Filter S310T due to a crack on the neck. I see the tank and the value do you just sell the tank itself with the lateral lines?

A  Answered on 10/21/2020 by InyoPools Product Specialist Hector F.

Hi Pat, we do sell the tank body but includes the skirt, drain, and lateral assembly for $983.99 and is a special order. The part number is 4802-72D. I would suggest considering replacing the entire filter at that point. 

?     Asked on 10/26/2019by Inyo Visitor

Hello, I am trying to calculate deck load. How much does the sand filter weigh with water being pumped into it? Obviously it will have 500 pounds of sand and an approximate volume of 65.4498 ft3. A gallon of water weighs about 8.3 pounds. and 1 cubic foot equals 7.48051948 gallons. So that's roughly 489.597 gallons of water at 8.3 lbs is 4,063.658 lbs + the 500 lbs of sand for a grand total of aprox. 4,564 lbs. Is this a close number of actual weight during operation? Thanks

A  Answered on 10/28/2019 by InyoPools Product Specialist Lennox H.

Hi. Unfortunately, we're unable to provide you with that info or the formula for calculating such a problem.

?     Asked on 9/28/2019by Craig Burgess

I purchased this last year and just noticed there is a crack in the side by where the pressure gauge screws in. The crack is about 2 inches in length. I winterize my pump every year and drain it so I am not sure what happened. Is there a warranty on this or a way to repair/patch the crack? my order number was 849833.


A  Answered on 10/15/2019 by InyoPools Product Specialist Rose J.

Unfortunately, this valve could not be patched. We do have the correct replacement for this filter attached belowhttp://www.inyopools.com/Products/02201268001093.htm

?     Asked on 8/12/2019by Gary

I need to replace my sand filter. I have an in ground pool that holds approximately 30,000 gals, and a 2” pentair CFII N1 2A/343240 pump, approximately 25’ away from the pool. What filter should I purchase?

A  Answered on 8/14/2019 by Industry Professional

This filter turns over 47,000 in 8 hours do you want to oversize your system? S244S turns over 29,760 gallons

?     Asked on 9/29/2018by juan carlos

what is the life time of this filter ?? a crak on the neck appears, is it normal ? 3 years in normal operation regards juancarlos

A  Answered on 10/10/2018 by InyoPools Product Specialist Hector F.

The lifetime of these filters really varies. I would say on the average 10 years plus but it all depends on the maintenance and installation. If the filter operated on too high of pressure then it could fail much sooner. If a crack occurs on a seam and or within the warranty for the body then it may be under warranty. 

?     Asked on 7/4/2018by Jenette

hi - my inground pool holds about 40,000 gallons - currently using a hayward Pro-Grid DE filter SP710XR50 with a hayward super pump 2.0HP model K48M2N111 I want to replace the filter with a hayward sand filter - which one would work best thank you

A  Answered on 7/4/2018 by InyoPools Product Specialist Lennox H.

Hi, Jenette. For a 40,000 gallon pool, I would recommend a 24" or higher side mount sand filter depending on your flow rate. To calculate the flow rate of your pump, use the steps in our How To Measure Total Dynamic Head With Gauges guide. 

?     Asked on 5/6/2018by Pacific NW Pool Owner

We have a 12,000 gallon pool (and a small 6x6 spa). What size sand filter would you recommend? We'd prefer to install an oversized one to reduce the frequency of backwashing. Our pump is the IntelliFlo variable speed.

A  Answered on 5/6/2018 by InyoPools Product Specialist Lennox H.

Hi, Pacific. This filter can be used if your Intelliflo Pump does not exceed a flow rate 98 GPM. 

?     Asked on 9/30/2017by Inyo Visitor

when you say 30 inch filter where id that measurement made?

A  Answered on 10/2/2017 by InyoPools Product Specialist Lennox H.

Hi. The 30" is the diameter of the widest part of the tank body.

?     Asked on 7/1/2017by Wayne Thomas

I have a Hayward S310T2. The water is constantly cloudy and I researched that the sand may have channels not allowing proper filtration. I opened the top and tried to reach my hand to the sand and see what the condition was. It did have clumps and was very dirty so it may have had channels in the sand. My question is how far the sand should fill the tank. I could barely reach the sand with my arm all the way in, about 34". It seems it should be fuller than that.

A  Answered on 7/4/2017 by InyoPools Product Specialist Alex V.

Wayne, The S310T2 holds 500 pounds of sand. The tank will be approximately 3/4 of the way full. 

?     Asked on 6/11/2017by Stephen Walker

Can I just purchase the filter body without the multiport valve? I need two of them. Thanks.

A  Answered on 6/11/2017 by InyoPools Product Specialist Hector F.

Yes, you can. It would be key number 6 on its parts diagram but it comes with the skirt, drain and lateral assembly. Maybe consider replacing the entire filter.

?     Asked on 6/10/2017by Gary Fowler

how much sand for 27" millenium filter 1.5 hayward filter

A  Answered on 6/22/2017 by InyoPools Product Specialist Lennox H.

Hi, Gary. They're a few different manufacturer that has a Millenium filter that requires anywhere from 200 to 350 pounds of sand.

?     Asked on 5/1/2017by Ryan

I have a 38k gal, 9ft deep inground pool with a Hayward SP2610X15 pump that is about 15 feet away from main drain and thinking of changing old cartridge style filter for Hayward S310T2 sand filter. Would this be a good combo?

A  Answered on 5/1/2017 by InyoPools Product Specialist Patrick P.

Hi Ryan, For the pool you have explained the S310T2 would pair quite nicely with your SP2610X15 pump.

?     Asked on 4/30/2017by Ronny

What size filter is recommended for 40000 gallon pool with 2 inch fittings?

A  Answered on 4/30/2017 by InyoPools Product Specialist Scott W.

The size of filter is going to depend on the flow rate that your filter is able to handle. What is your pump model and what is the distance from your pump to your skimmers to calculate the flow rate to properly size your filter.

?     Asked on 4/19/2017by Joe

Am I able to order just the handle for my valve system model S310T2?

A  Answered on 4/20/2017 by InyoPools Product Specialist Scott W.

The handle for the valve on your Hayward S310T2 is part number 4701-01.

?     Asked on 3/21/2017by Jay

I need to replace my filter and I'm thinking about getting the Hayward S310T. I want to make sure my current pump matches up well with my new filter. I have a 2HP Hayward Super Pump with a flow rate at 40' of head of 98 GPM. The pool has about 27,000 gallons of water. I realize the filter is probably bigger than what I need, but I feel I need to go big to match up with the pump. Will the Hayward S310T work well with my pump? Thanks!

A  Answered on 3/22/2017 by InyoPools Product Specialist Andy O.

Hello Jay- The filter I would recommend going with is the if you have anything less than 40 feet of head Sand Filter with Top Mount Valve 36" Tank - S360T2. If you have 40ft of head or more you could go with the S310T2. If you decide to go with the S310t2, I would recommend the Clearance - Sand Filter with Top Mount Valve 30 Inch Tank - 8-S310T2.

?     Asked on 9/26/2016by Kelly

I want to install new S310T2 Top mount sand filter. The current motor size is 3HP. Is that to big?

A  Answered on 9/29/2016 by InyoPools Product Specialist Scott W.

That filter can handle 98 gallons per minute, so it will depend on what the flow rate of your current pump. I will need to know the model of your pump, not the motor, and the distance from your pump to the main drain to calculate the flow rate.

?     Asked on 9/14/2016by Leo C

I have a Hayward S310T2 with a cracked vari-flo valve. The model of the vari-flo valve is SP071620TFV. Will a SP071621 replacement valve fit my S310T2? Thank you.

A  Answered on 9/15/2016 by InyoPools Product Specialist Scott W.

Yes, that is the replacement valve with 2" ports for that filter.

?     Asked on 7/15/2016by Inyo Visitor

Do you sell S310 with 1 1/2" plumbing? Do not want to change anything on current system. Thanks

A  Answered on 7/16/2016 by InyoPools Product Specialist Lennox H.

Hi, The S310T2 filter valve is only available with 2" ports.

?     Asked on 5/28/2016by greg

I have a S310T Hayward sand filter that is about 10 years old. is the S310T2 the replacement model? Also the only reason I am replacing it is because the male fitting threads are wore out at the drain. are there any parts that can be purchased to plug the drain inside of the spout like a self tapping plug? Finally, does the model mentioned above come with the top rotating valve or is that sold separately? my valve # is SP071621

A  Answered on 5/29/2016 by InyoPools Product Specialist Alex V.

Greg, The S310T2 will replace your older filter. The filter comes with a 2" valve.

?     Asked on 4/27/2016by Inyo Visitor

I'm looking at the s310t2 pro series sand filter. I have a 22,000 gallon pool. My pump is a 3/4 horse. It seems to be efficient enough for the cartridge filter I currently have. Is the 3/4 horse pump adequate for this sand filter model?

A  Answered on 4/27/2016 by InyoPools Product Specialist Lennox H.

Hi, A 3/4 hp pump is sufficed for the S310T2 filter.

?     Asked on 4/8/2016by Kurt Hartle

I have the following: 36,000 gallon in ground pool 1-HP Hayward pump S310T (500 pound) Sand filter Seems like a lot more filter than needed AND thinking about a Variable speed pump..... am I going to have filtering issues with reducing the GPM?

A  Answered on 4/8/2016 by InyoPools Product Specialist Lennox H.

Hi Kurt, You will not have a filtering issue when the rpm's are reduced.

?     Asked on 8/5/2015by Patricia Winkles

I know I need 500lbs But what kind? There is the sand alternative Zeobest . Silica Sand #20 high rate what if it just says #20 grade 50 lbs it doesn't say high grade

A  Answered on 8/5/2015 by InyoPools Product Specialist Joe S.

Hello Patricia, Yes 500 lbs of Silica filter sand. The superior alternative to sand - for better filtration & water quality! Start using Zeobest instead of sand in your sand filter. Using 100% natural minerals, Zeobest provides excellent water clarity, purity, and quality. Zeobest has nearly 9800 times more square footage than sand, enabling it to filter small particles down to 3 microns for exceptional water clarity - that's 10 times smaller than sand! This amazing filtering media also removes the ammonia produced from dead organic material in the water, reducing eye irritation and odor. Plus, it cuts down on chemical demand, saving you money on chemicals. Zeobest is easier to use than sand. You will only need one pound of Zeobest for every two pounds of sand your filter requires - half the effort! Since Zeobest has a greater capacity for particulates than sand, backwashing will be much less frequent.

?     Asked on 8/5/2015by Patricia Winkles

how much sand does a S310T2 need to change the sand in the filter

A  Answered on 8/5/2015 by InyoPools Product Specialist Joe S.

Hello Patricia this filter requires Sand:500 lbs. or going with Zeosand 250 lbs

?     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.

?     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 6/2/2015by 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 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 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.  


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.

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