Welcome, cssl51202 from Florida, Glad that you have joined us. May your journey bring you the knowledge that you seek, put a smile up on your face, create hours of pleasure to stimulate your mind, an a healthier life style for your heart...from Apollo__Phoenix, Arizona.

I have a larger system and my GB's fill in about 9 minutes and drain in 4 minutes. About 4 X's an hour, I thinks is the rule and it should include turning over your total FT water 2 x's per hour.

If you want to view my set up from start to now, check out “Fire Pit … AP” then “Pipe Siphon by Apollo” and ending with "Got Vertigrow?".

____________________________________
I HAVE NOT FAILED. I'VE JUST FOUND 10,000 WAYS THAT WON'T WORK. Thomas A Edison