I'm using the OM Squirt on my return, and it's awesome.
Only problem I had was when I had a bit of sand in the sump, and the return pump pumped some into the Squirt, which caused it to seize. I had to take it apart to clean it a few times before all the sand stopped coming up. Havent had a problem since.
However, I will be replumbing everything and use it on a true closed loop in the coming weeks.
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