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My O-ring pump seal dripped on my coralife 500 calcium reactor.
I bought 1 size thicker and 1 size smaller diameter O-ring for about $0.20 . It's never leaked for over a year now. I also totally drilled out the extremely restrictive venturi directly above the pump mount. Now it circulates the water in the reactor like a river, and efficiency and performance increased in a big way. I use a paristilic pump to feed it, so I had no need for the venturi.
After these 2 mods that took about 10 minutes, I've been very pleased with the performance. Hopefully they can help you too!
Best Wishes,
-Luke
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