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The standard a/g filter types are Sand, Cartridge, and diatomaceous earth, or DE; these filters operate differently but the method of sizing them is the same. You should consider the following when sizing a new above ground pool filter:
Firstly, your pump’s HP is a major key to narrowing the field of filters suitable for your pool. If you need help finding or just want to confirm you have the correct sized pump, check this video’s description for a link to our guide called “How to size an Above Ground Pool Pump” Now we’ll go through each filter type, matching standard pump horsepower with the suggested filter size.
Now we have a window of filter sizes we can consider four pool, let’s think about variables that may cause you to upsize your filter. The larger the filter the longer you can go between cleanings. Oversized filters can hold more dirt without sacrificing flowrate or spiking filter pressure.
If you are the party pool in your neighborhood, that means more swimmers and inevitably more dirt. If you don’t want to spend the day after each part doing pool chores.
Larger filters also have higher flow rate capacities, this makes for lower back pressure compared to the smaller models. Less backpressure makes for less stress on the pump, filter and plumbing as a whole.
I’m new to this I was wondering what size sand filter system do I need to get for a 18 ft above ground pool
Reply
InyoPools Product Specialist Matt S.Posted: 8/30/2022
For pools that are 15’ to 24’ Round. A 16-Inch Tank or bigger would be suitable.
Reply
JeffPosted: 5/23/2022
I have a 24 ft round pool a 1 hp pump and 19” sand filter. Will I be ok with this set up?
Reply
InyoPools Product Specialist Matt S.Posted: 5/25/2022
Yes, that is a suitable set-up for that pool size.
Reply
MarkPosted: 8/29/2021
When you say a 16" or 18" sand filter, what is measured" What dimension makes the sand filter 16" or 18"?
Reply
InyoPools Product Specialist Matt S.Posted: 9/1/2021
The diameter of the tank is 16" or 18". Most sand filters will list the tank size in the title or have it stated in the description. You can view the sizes and specifications of our filters here, sand filters section.
Reply
Mark KroesPosted: 9/1/2021
Thanks for the reply. I have an older filter that has no labels left on it. I was curious to know what size it is but did not know what to measure. Now I know. Thank you.
Reply
InyoPools Product Specialist Matt S.Posted: 9/1/2021
I have 33’ round 54” deep pool. So it’s 30,000 gallons of water.
What size pump, and filter do I need?
Reply
InyoPools Product Specialist Matt S.Posted: 3/1/2021
The size of your filter would depend on the type of filter, which is how we break it down in the guide above. What type of filter do you want to install on your 33' round pool?
Reply
DanPosted: 7/19/2022
I also have a 33' pool, currently with an Intellipro pump and a Hayward Xtream 150sqft filter. I'd like to inquire about putting a better/larger/durable filter in my pool. I keep my psi at a max of 15psi (clean cartridge), but the locking ring has broken on me two times over the years. I did have the priming function on before, it is now disabled (due to not needing it).
What type and size of cartridge filter do you recommend? Also, if I get a new liner in a year or two, would you keep the standard inlet/outlet or go with another configuration in the rather large Above Ground Pool.
Thanks
Reply
InyoPools Product Specialist Matt S.Posted: 7/22/2022
It sounds like you put an inground variable speed pump on an above ground pool. Is that correct? What is the model number of the pump? The XStream filter's locking ring is notorious for being fragile. So, you could probably still use another 150-square-foot filter, and it would work fine. Most variable speed pumps have a high-end limit; this prevents the motor from going over the set RPMs to prevent damaging your other pool equipment.
Reply
William J WaligorskiPosted: 8/30/2020
I have a 16x32 rectangle on ground pool with a 2 HP pump and a Hayward C751 cartridge filter. and a GPM of 75.
I am thinking I need a larger filter and am looking at the C1200 for a 120 GPM.
My issue is water flow from my return, does not push water very far and am wondering if the larger filter would help this.
Reply
InyoPools Product Specialist Matt S.Posted: 8/31/2020
Has this flow issue been a constant problem, or is it something that has recently cropped up? I ask, because if it is a recent problem, it may be a sign that the cartridge is dirty or needs to be replaced. Also, what is the PSI rating on the filter when the pump is running?
Reply
InyoPools Product Specialist Matt S.Posted: 8/31/2020
When you say "begins," does it spike to a higher pressure after a few minutes? And is this a new problem, or has the pressure been a concern since those two pieces of equipment have been installed?
Reply
William WaligorskiPosted: 8/31/2020
my pressure rises gradually as water is filtered quicker when vacuuming but find the need to clean daily
Reply
InyoPools Product Specialist Matt S.Posted: 9/1/2020
Is this a new problem, or has the pressure been a concern since those two pieces of equipment have been installed?
Reply
BillPosted: 9/1/2020
It seems since I went to the cartridge (from earth) and new pump I have more water issues, especially algae. Vacuuming more now than ever.
Reply
InyoPools Product Specialist Matt S.Posted: 9/1/2020
I am leaning towards the filter being too small if the PSI starts that high, and it requires you to clean it every day. I would go with the C1200 to be on the safe side. The C900 would be a half-measure, and likely would not completely fix the problem.
Reply
William WaligorskiPosted: 9/1/2020
thank you, 1 more question. What size filter is in the C1200
Reply
InyoPools Product Specialist Matt S.Posted: 9/1/2020
Derek Posted: 8/27/2022
I’m new to this I was wondering what size sand filter system do I need to get for a 18 ft above ground poolReply
InyoPools Product Specialist Matt S. Posted: 8/30/2022
For pools that are 15’ to 24’ Round. A 16-Inch Tank or bigger would be suitable.Reply
Jeff Posted: 5/23/2022
I have a 24 ft round pool a 1 hp pump and 19” sand filter. Will I be ok with this set up?Reply
InyoPools Product Specialist Matt S. Posted: 5/25/2022
Yes, that is a suitable set-up for that pool size.Reply
Mark Posted: 8/29/2021
When you say a 16" or 18" sand filter, what is measured" What dimension makes the sand filter 16" or 18"?Reply
InyoPools Product Specialist Matt S. Posted: 9/1/2021
The diameter of the tank is 16" or 18". Most sand filters will list the tank size in the title or have it stated in the description. You can view the sizes and specifications of our filters here, sand filters section.Reply
Mark Kroes Posted: 9/1/2021
Thanks for the reply. I have an older filter that has no labels left on it. I was curious to know what size it is but did not know what to measure. Now I know. Thank you.Reply
InyoPools Product Specialist Matt S. Posted: 9/1/2021
Measure the diameter of the tank to figure out the size. Refer to step 2 on this guide, How To Identify the Make and Model of My Pool FilterReply
Anonymous Posted: 2/21/2021
I have 33’ round 54” deep pool. So it’s 30,000 gallons of water. What size pump, and filter do I need?Reply
InyoPools Product Specialist Matt S. Posted: 3/1/2021
The size of your filter would depend on the type of filter, which is how we break it down in the guide above. What type of filter do you want to install on your 33' round pool?Reply
Dan Posted: 7/19/2022
I also have a 33' pool, currently with an Intellipro pump and a Hayward Xtream 150sqft filter. I'd like to inquire about putting a better/larger/durable filter in my pool. I keep my psi at a max of 15psi (clean cartridge), but the locking ring has broken on me two times over the years. I did have the priming function on before, it is now disabled (due to not needing it). What type and size of cartridge filter do you recommend? Also, if I get a new liner in a year or two, would you keep the standard inlet/outlet or go with another configuration in the rather large Above Ground Pool. ThanksReply
InyoPools Product Specialist Matt S. Posted: 7/22/2022
It sounds like you put an inground variable speed pump on an above ground pool. Is that correct? What is the model number of the pump? The XStream filter's locking ring is notorious for being fragile. So, you could probably still use another 150-square-foot filter, and it would work fine. Most variable speed pumps have a high-end limit; this prevents the motor from going over the set RPMs to prevent damaging your other pool equipment.Reply
William J Waligorski Posted: 8/30/2020
I have a 16x32 rectangle on ground pool with a 2 HP pump and a Hayward C751 cartridge filter. and a GPM of 75. I am thinking I need a larger filter and am looking at the C1200 for a 120 GPM. My issue is water flow from my return, does not push water very far and am wondering if the larger filter would help this.Reply
InyoPools Product Specialist Matt S. Posted: 8/31/2020
Has this flow issue been a constant problem, or is it something that has recently cropped up? I ask, because if it is a recent problem, it may be a sign that the cartridge is dirty or needs to be replaced. Also, what is the PSI rating on the filter when the pump is running?Reply
Bill Posted: 8/31/2020
my PSI usually begins between 18-22Reply
InyoPools Product Specialist Matt S. Posted: 8/31/2020
When you say "begins," does it spike to a higher pressure after a few minutes? And is this a new problem, or has the pressure been a concern since those two pieces of equipment have been installed?Reply
William Waligorski Posted: 8/31/2020
my pressure rises gradually as water is filtered quicker when vacuuming but find the need to clean dailyReply
InyoPools Product Specialist Matt S. Posted: 9/1/2020
Is this a new problem, or has the pressure been a concern since those two pieces of equipment have been installed?Reply
Bill Posted: 9/1/2020
It seems since I went to the cartridge (from earth) and new pump I have more water issues, especially algae. Vacuuming more now than ever.Reply
InyoPools Product Specialist Matt S. Posted: 9/1/2020
I am leaning towards the filter being too small if the PSI starts that high, and it requires you to clean it every day. I would go with the C1200 to be on the safe side. The C900 would be a half-measure, and likely would not completely fix the problem.Reply
William Waligorski Posted: 9/1/2020
thank you, 1 more question. What size filter is in the C1200Reply
InyoPools Product Specialist Matt S. Posted: 9/1/2020
Cartridge for Hayward C-1200 (PA120)(C-8412) - PL0146Reply
Anonymous Posted: 7/16/2020
Is there any sand filter for my 10×30. Prism Metal frame pool?Reply
InyoPools Product Specialist Matt S. Posted: 8/24/2020
A 16-inch sand filter should be suitable for a pool of that size. For example, Sand Filter with Top Mount Valve 16" TankReply
Jorfe Posted: 6/8/2020
My above hrs pool is 16x32 4.5 deep what size of pump sand filter I need?Reply
InyoPools Product Specialist Matt S. Posted: 10/20/2020
From Step two in the article: 15’ X 27’ to 18’ X 33’ - 18-Inch Tank & UpReply
Mass Posted: 3/7/2020
12x24x54 oval pool what de size filter do I needReply
InyoPools Product Specialist Matt S. Posted: 3/9/2020
In step 4, your pool size is listed.Reply
Emma Posted: 6/19/2019
What is sand filter do I need for my 30 foot above ground poolReply
Anonymous Posted: 7/9/2019
15x30 oval above ground 4.5 deep I currently have a 1.0 HPReply
InyoPools Product Specialist Matt S. Posted: 6/19/2019
Refer to step 2 in the guide.Reply