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Yes, try adding chlorine with each use. Try using the weekly MPS dose. See what that does.
We have hundreds if not thousands of customers who successfully use the MPS with each use and and shock weekly with chlorine.
So what is the reason for 100% no by pass filtration again? 8-)
A good filtration system and good ozone will help a lot but at the same time, if you're not sanitizing enough you're going to run into this situation.