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Originally Posted by albert_dao
I don't think anyone does it because most people have MUCH, MUCH more than 300 gph going down their standpipes. I know I've done what you're describing in the past at 700ish gph and it would gurgle unless I capped the unit. Even then, I wasn't able to push more flow through the unit without drilling more holes in the standpipe; this would just defeat my original intent.
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Why can't you drill more holes? Just curious. I'm not sure why twice as many holes over the length of a larger pipe wouldn't work for 600-700GPH. The idea is to have the water flowing into the top holes at such a slow rate that there is no splashing and no sucking of air into the pipe.