I've yet to find a reliable check valve for saltwater use. the buildup of detritus and calcium carbonate always causes the check valves to fail over long term. Holes near the water line of the return is much more reliable especially if you get a stick and poke through the holes every 4-6 months.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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