An easier method might be:
1. run a loop of hose from pump to reactor inlet. Top of loop should be at the height of the water in the reactor.
2. install a barbed t fitting at the top of the loop.
3. add more hose to leg of the T facing up. This should loop up another foot and then back down so if any water comes out from pump it goes into the sump. This acts as a siphon break.
This is one reason why I abandoned GFO and went to Foz Down. Too much hassle with reactors, flow rates, clumping and back siphoning.
Cheers,
Tim
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