That is a lot of water to change in a week. Do you have a drip, or back flush or something? I assume 750 each time?
Attaching a FTS, but the overflow is cut off. Circled in red on the left. Overflow from the sump goes from the garage into the garden outside.
I have a hose that is stationed in the far right chamber attached to a water source.
I have an in-line carbon filter connected to an in-line analog water meter.
Basically I just turn on the faucet and let it run for about 18 hours and that gets me 1500g of new water into the tank.
So a total of 3K gallons of water changes a week. That's just for now while those Fogos are clearing up their bruises and torn fins
Eventually I'll go back to once a week changes.
They are spoiled from all the good clean water.
My water bill ain't cheap lol