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I would not have plumbed it that way and if you can change it, you should. Run one 2" line from the sump up to the top of the tank and then split to multiple 1" or 3/4".I have a 220 gallon tank and a 100 gallon sump in the basement. The head is 10 ft. I have 1 inch PVC returns all the way to the tank. Will the COR-20 be sufficient? This is a reef tank.
I would not have plumbed it that way and if you can change it, you should. Run one 2" line from the sump up to the top of the tank and then split to multiple 1" or 3/4".
I do not exactly understand when you say 1" PVC returns - do you have more than one return line coming from the sump up to the tank.
The real answer to your question is how much flow you want to get. The COR-20 plumbed the way you have it now - assuming one 1" return will mean that you get about 300-600gph actual flow - depending on all the fittings, etc. With a 2", that will likely improve to about 400-800. Again many variables.
Another option - one that I really like (try not to be cynical and think I only say this to sell pumps - hehehe) - is to run two pumps to the tank and you likely will never have an issue with zero flow to the tank due to a blocked or failed pump. You can also take one offline to clean it while the other keeps the tank circulating.
If you are looking to get crazy flow through your sump, you will need to up to a much larger pump or one that is a pressure pump.
Haha. I do like the idea of 2 pumps. I get it.
Here is my sump. 1 1/2 coming out of sump. Then splits into two return lines up to tank. One on each end of tank. The third one you see in pic goes to house drain for water changes. My pump now is a baldor motor with a reeflo hammerhead pump. I want to replace it wit a COR-20. Or 2?
You can see the return in the one picture of the tank. There is one on each end.
At 100% with that plumbing I would say so. I run a 425g tank with 1150gph (actual). I would bet that you will likely turn about 6-7x the total water volume (probably about 200g).