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I have an above-ground pool that holds 12,000 gals. I am switching to a new cartridge filter system & need to know what size machine i need. The choices offered are: 25, 50 & 75 sq. ft. Then either 3/4 or 1 hp. Could you please advise on the correct combination for my size pool? Thanks in advance, you've never steered me wrong yet!

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The largest pump you can afford. The more water you can change over in a pool the better, plus, the added filter capacity will lessen the chance of clogging the filter sooner than you can get to it. Performance of the pool will be better overall. Just make sure you are still using the same amounts of pool chemicals per your pool size.

Posted on May 08, 2014

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Posted on Jan 02, 2017

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2 Answers

Our pool is about 90000 litres of water so how big filter do we need please


If you have a above ground pool go with the Cartridge or sand, and if underground go sand or D.E. All have their ups and down you should find out what you want from them specifically cause they all do varying amounts of the same thing.

Sand Filters
(Filters using literally sand)
For sand filters, on inground pools, I like to use a 30 inch tank diameter, which is a 4.9 sq. ft. filter surface area, and holds 600 lbs of sand. For small pools (under 20,000 gals), I might advise the next size down (24 inch tank), if the budget is tight. But never go smaller than a this for an inground pool.
Cartridge Filters (like a air filter)
I have a rule of thumb for cartridge pool filters. 100 sq. ft. of filter surface area per 10,000 gals of pool water, as a minimum. I like to see the 400 sq. ft. models on inground pools above 25,000 gals. These can go an entire season without cleaning in most cases.
D.E. Filters (Ground up fossilized algae)
Because they offer the most superior type of filtration, people tend to go small with DE, and buy a 24 or 36 sq. ft. DE filter. Ugh - go Big! Nothing below a 48 sq. ft. filter, and if your pool is over 25,000 gals, go with the Big Boy - the 60 sq. ft. filter.

Swimming Pool Blog


Also make sure the filter can take the amount of water that the pump is pushing through it.

Jul 23, 2015 | Pool & Spa

2 Answers

Can intex krystal clear saltwater system be used on 12000 gal. above ground pool?


personally, my opinion is no. if you have a real pool, get a real salt system.

Sep 08, 2014 | Intex Automatic Salt Water System for ...

1 Answer

My intex salt water system alarm goes off and code 90 is flashing and there is little flow. If I take out the type A filter to the pump that came with my Ultra Frame above ground pool, the flow is...


What you need to do is either clean out the filter cartridge or replace it with a new one. If you have a spray nozel for your hose you can clean the cartridge by adjusting the nozel so it is a small but strong stream. Run the stream up and down on the cartridge until all the area has been covered and then install it in the system. If you still have little flow then you should replace the filter cartridge.

I hope this helps.

Jul 05, 2011 | Intex Automatic Salt Water System for ...

1 Answer

Ive had the pump and salt water system going on boost for days...added the appropriate amount of saltand the strips still are giving me a reading of zero...is the pump too weak?? i have a 15' dia x 4'...


What is the appropriate amount of salt? The manual is only a starting point.
You need a salt test kit that reads in #'s not color
Get your pool to as close to 3000ppm
as you can any lower than 2800 and you will not generate enough chlorine any higher than 3700 and you can become cloudy and bad tasting


Yes the pump is weak and will create problems in the future with your system turning green
You need to continually use a non foaming algaecide along with a stabilizer to help hold the chlorine level

chlorine is consumed in many ways heat,sun,sun tan oil,rain,#of swimmers and so on so there may be days you need to generate 5 hours and sum 12 you will get used to what is good for you

Also clean the junk paper cartridge every day intex pumps are not even close to being sufficient for the size pool it comes with

I will use generic #'s for this illustration since I do not know your gallons of water or pump size

any pool needs to be turned over at the very least 3-4 times in a cycle
if your pool is 5000gl and you have a 1500gl ph pump you see that it takes 10 or so hours to filter at the minimum now add in that the pump slows down a bit when the paper filter gets loaded

A cartridge filter can look clean but be clogged with little particles that you do not see

Hope all of this is some help

Just remeber filter filter filter

Jun 27, 2010 | Intex Automatic Salt Water System for ...

1 Answer

Water not clear


cloudy water is mainly due to poor pool maintainence.
Your purchase of the salt water system only helped you with not needing to pour chlorine in or float tablets.
You will still need to use chemecals.
I use a good stabilizer to hold the chlorine level longer
I use a non foaming algecide once a week
I also use a water clarifying product once a week

Now on to the clouds :-)

cloudy water is because of not enough sanitizer mixwd with a crappy pump from intex

I do not know the size of your pool so I will just use mine to show you #'s

I have a 7000gl pool with a 2500gl ph pump
A pool needs to be turned over at LEAST 3 times a day so for me it takes at least 8 hours of filtering alone this does not include making chlorine.
Bottom line is you should run your system 24/7 between generating and straight filtering

The only cure for less filtering is to get a sand filter with at least a 1 horse power pump to pump 4000gl and uphaving a sand filter helps trap more small particles than the cartridge filter.

I noticed the difference the first night I had my sand filter. It ran for 6 hours before me turning my pool light on and to my surprise I did not see as many particles passing my light as with the cartridge filter and the second night nothing Crystal clear.

Bottom line is intex pumps and so on are not big enough for the pool it comes with.

The salt system alone with a sand filter is great

Jun 26, 2010 | Intex Automatic Salt Water System for ...

1 Answer

2500 Gal Easy Set Swimming Pool Water Filter Replacement Pump only: how to converte to larger filter...


You can simply buy a larger pool filter that is designed for pools in your size range. Look for one that is designed for smaller above ground pools. You can find lots of different pool filters at backyardcitypools.com.

May 17, 2010 | Intex 2500 Gal Easy Set Swimming Pool...

1 Answer

NOT FILTERING, NO SUCTION, CHANGE SAND,,,SINCE DAY ONE..WRONG HP?


You are correct. Your lines are extremely small for this system and the pump is to small for this system. You are going to have to do a total upgrade. from the pump to all the lines. I know this is bad news, but it is a common problem for system that where put in more then 10 years ago

Jun 01, 2009 | Hayward SAND FILTER, PRO SERIES

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