I don't know about your buttress free question, but I just wanted to ask about your filter--a 1.5 HP pump seems awfully big for that filter. I think you'd do better to either downsize your pump (the other equipment folks will chime in here, I'm sure--they know much more about pump/filter matches than I) to a 1 HP, or upsize that filter. If you have too big a pump and too small a filter, the pump will just drive the sand and filtered debris right through the filter and back into your pool. MIght be okay for awhile, but when you have to clean up the first algae outbreak, you'll realize what a headache that's going to be...
Someone should be along shortly that can address your question, I just wanted to throw the pump/filter thing out there for you to consider....
Welcome to the forum!!!
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