I have a small bed that I am testing for growing, but will expand as we move forward. The bed is 17 in wide, 24 in long, 5 in deep. Have 1 inch stand pipe 4 in high at the corner of bed. Have 2 in bell and it caps right at the top of the stand pipe. Have 3 in guard around the bell. Have it able to get to drain as long as the bed fills up in less than 5 mins, and takes 1 to drain. If I slow down flow rate, then it just starts to trickle as same incoming rate. I have 1/2 in pipe for inbound flow. The stand pipe has a 3/4 reducer that goes to 90 degree horiz and then about 10 inches and goes 90 degree down. It does take the water down to about 1 inch, but if I slow the water rate down to trickle, then it will fill up and stay at that same rate out the pipe and will not flush. It worked perfectly until I added the hydroton. I was able to set the ball valve to 15 mins fill and 2 flush.
Can someone help me please? Thank you