EventHorizan
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Good question,There is an inch to two inches of bio balls surrounding the rockwool cube. If everything is working correctly only small amounts should be splashing through.
I was going to remove the sprayers and just have the quarter inch line piss water into the buckets. That way only the water and bubbles from below will be contacting the roots and cup. Once I did that the water level got a couple inches higher in the plant buckets. I assume the return lines couldn't keep up with the flow but that surprises me a little.
Do you think it would have equalized if I let it go or not?
BUT
I 100% AGREE that you should remove the sprayers and let it piss into the bucket.
Dont be scared of the hydroton.. I can help you clean and reuse.. Ive been reusing mine for 2 years!
As for the buckets filling up, we have 2 choices. We can increase the size of your return lines. They are 1/2" if im correct? 1" to 2" will allow it to flow. But you could put a cheap plastic shut off valve coming off the pump from the output, to close up some to slow the flow to match the return flow..... Second option is cheaper... just make sure to put the shut off valve on the output side. You dont want it on the input side as you will burn the pump up