I previously had a soft sided 18' Intex pool with a Intex SWG. Currently I have a 24' hard sided pool that I have used liquid chlorine in for 2 years. The pool is also hard plumbed. I would like to convert to a SWG but after pricing the systems they are not in the budget. I see Intex has one that goes up to 15,000 gallons I think. They are decent for a couple of seasons right?