I run 3 gph of cold through an emitter it can get a little expensive on the electrical bill in the winter with the heaters running more. I use the same basic system as t1 and toby with the drilled sump etc..
My system changes out 21% of the water every day or around 83% a week after you use the calculator
My heaters are never on I have 3 big pumps in the sump 2 x 18,000 lph and 1 x 30,000 lph if I turn my drip off the tank will run at 90 just from the heat of the pumps and heat from the 4 x 25w uv run back to back
I run about 200 gal per day of cold water in and the tank sits at 85 with no heater
The pumps do use a lot of elec 1kw just for pumps and uv
I stir up my sump every month and you can even see 1 inch in the tank I then turn the drip on full over night to clear the tank that's when the heaters come on as the tank temp drops to 82 and it cost money to heat it up with 1kw of pumps and 2kw of heaters
It's just a case of setting it up what works best for you as my sump it 24inch deep the drain lets me fill the sump with 18inch deep of water which you wouldn't be able to do with out the drain as if you had a power cut the back flow of water into the sump would over flow on the floor
I had non return valves on my pumps do you didn't get as much back flow but I took them off as with them you can't back wash the pumps which I like to do once a month just by turning the pump off for a few mins then turning it back on again
You would be shocked at the amount of crap that comes out of the uv when you back wash then
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