split your drain line into the wet dry. you'll have smaller line going to the ref, and the main line going to the wet dry.
the line going to the ref, should havea
ball valve so you can control the flow going into it.
then you will want to have the ref overflow into the wetdry.
or you can put the ref above the tank and have small pump going into it, and have it overflow back to the main tank.
either way will work.
make sense?
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