I actually did read your post yesterday but hesitated to respond because I already shared my opinion with you in regards to a 1.5hp pump in a 13K gallon pool in this thread: http://www.poolforum.com/pf2/showthr...-loves-my-pool
It could be your spider gasket but I still think as I did before that your pump is probably just too big and forcing debris through the filter. (I have the same size pool as you and I have a full-rated 1/2hp inground pump-- not commercial grade -- and it is plenty big enough. I have a 200# filter.) I hope you find out that it is the spider gasket because that will be a cheap and easy fix for you. Good luck.
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