That pool will hold about 21,000 gallons of water so you should not look at anything less than 25,000 to 30,000 gallon sized. I can't give specific recommendations but others will be along soon.
There are many good brands of SWG that all work well. Which one is best for you depends on what issues are important to you. Are you concerned about keeping costs down, or maximum connivence, maximum reliability, etc?
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