I currently use a CPR overflow with dual 1" intakes. These feed into the trickle tower of my sump. I have gate valves on BOTH of the intakes just under the CPR overflow.
I am confused and am hoping that someone can set me straight in terms of flow and noise reduction. Here is my confusion.
These are 'facts' in my mind, but may not in fact be 'facts'
1. I understand from web research (I know) that a 1" diameter hose can flow approx 500-600 gph.
2. The CPR model I used is rated for 1200 gph. 2 x 1" intakes at max flow I assume is how they arrived at this value.
3. I have a mag 1800 gph driving the sump return.
4. Per the bean animal setup and other basic advice, folks say to do the following:
a. Use one siphon as full and be completely open.
b. Reduce the second siphon via the ball valve so it is NOT a full siphon.
c. Somehow magically, the FULL siphon will still flow the FULL AMOUNT OF BOTH INTAKES ???????
I am told that the full siphon should be quiet and the reduced siphon should be quiet as well. Okay, I get that and it is true.
My issue, however, is that when I CLOSE the second gate valve (not fully of course) to reduce the noise level, the FLOW to the sump and then back to the tank is MUCH REDUCED.
I am unsure how the flow for 2 1" intakes can be handled by a single 1" intake even if at full siphon. What am I missing here? This makes no sense to me whatsoever.
I can lower the noise level sure, but only at the cost of much reduced flow. I know I am missing something, but what is it???
I don't want to have a quiet tank but only flow 500-600 gph or so. That is not enough for a 220 gal tank or what I want to accomplish.
Appreciate any help.