Multiport Valve Sending To Waste while on Circulate

Jul 14, 2015
5
Houston
So I just started an AA treatment today for some stains in the pool. I set the multiport to recirculate as to cut out the filter and keep the AA moving around. When I did this I noticed quite a bit of water was being sent out to waste and the pool level was dropping. It was not as much water as when setting to waste so I am thinking the spider gasket may be bad. Any other possibilities that could cause this issue?
 
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Though a more major failure of the valve or filter plumbing could cause it, a bad gasket is the most likely culprit.
 
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