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I may try one last spider gasket and glue it down to see if it will last longer. And I think that over the years the quality of these products has gone down. The MTBF is much less then it used to be--at least for these valve gaskets. I used to only have to replace the spider gasket every 4-5...

Thank you duraleigh. I do only rotate the handle in one direction and I never attempt to turn it while the pump is running.

Thank you for you feedback James. However, I don't think it's a chlorine problem because when I open the valve to replace the gasket, the gasket is always pulled out of its seat and chewed up. Further, the gasket always goes bad immediately after a backwash or vacuum to waste. I can generally...

I have a tube chlorinator on the return line side. No chlorine is passing through the multiport valve other than what's in the pool water.

I'm new to the forum and initially started this in reply to a user questioning why the "multiport valve hate." However, after registering the site requested that I start a new topic so the first part below is in response to the users OP and my question is at the end. I don't know why the...