I have a 18' x 33' agp that is only three feet to the waterline and, by my estimate, only holds 11,500 - 12,000 gallons of water. I would like to use one of the Intex SWG units (the ones on Amazon seem to even have a built-in pump?). Are these Intex units capable of chloronating a pool of this size (there is no mention of the 2000 GPH unit on the vendor website let alone capacity specifics. Any other caveats? Thanks all!