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If you have the old drain system with one drain and return on the two side of the tank maybe the reason why one is coming down faster and stronger than the other one which may need to travel longer to drain. Also if this is the case, float valve won’t work.
I mean for you to put one like this down under the water line well below~
You can also lower the rerun flow rate to slowdown the drain.

Edit: Gate valve and not float valve.
I mean for you to put one like this down under the water line well below~
You can also lower the rerun flow rate to slowdown the drain.

Edit: Gate valve and not float valve.
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