Filling the tank for the first time
 

Well I'm almost there. My sump is mostly built and my stand is ready to be picked up tomorrow :biggrin: Plumbing will be my next challenge, but I've been wondering how bad it would be to fill the tank with water from the garden hose the first time around?

I have a 75 gpd RO/DI filter, so I could make up RO water, but the tank is 120 gallons with a 40 gallon sump (a lot of water and a lot of waste). If I'm gonna make that much filtered water I'll have to get it started sooner than later.

never a bad idea to do leak tests and tap water is fine for that

Run the r.o. straight into the tank, 2 or 3 days should work.

Yeah just use the RO, you'll regret it later. Not a good way to start a new tank.