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Thanks for the reply. My spa sits in a deck and gets very little grit or sand. It almost seems like a chemistry problem, but my water is almost always in balance and I don't believe water normally interacts with the check valve itself. Could it be the ozone itself deteriorating the mechanism?
I just had to replace mine on a 1.5 year old Jacuzzi J330. I think it's due to sediment or sand being brought into the tub. I'm not an expert but that's my guess since the old ones when it went bad had mucho grit. I have paving stone patio set with sand surrounding the tub. Since then I place a pan for washing feet before entry. If anything it should help the diverter valve from getting scratched internally and causing it to stick since that was also a problem. So far so good. Good Luck.
Another selling point for the HS dealers to give to customers. 100% filteration wont let anything into the pumps or ozone system. This problem would be avoided
What about when the tub temperature reaches > 2 degrees higher than what it has been set too and the circ pump turns off? Not positve HS does this but Beachcomber and D-1 do...