losing water out waste

Most likely, the multiport spider (spoke) gasket is bad and needs to be replaced. It is not a super-hard fix if you are relatively handy.

Worst case, you might need a new multiport valve.
 
Thanks James. So what is the best way to test this? Do we just get a new gasket, and if that works, problem solved? Our system is starting it's 4th season I believe. We were getting ready to change out sand once we get the pool cleaned out, etc. Do you have any idea what the life expectancy on the type filter/pump we have, by chance? Guess I'm wondering if this multiport valve would most likely be the culprit for a system the age of ours. I have no idea how long these things should hold up!
 
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