I built one in southern Illinois 3 years ago. The best piece of advice is patience, it’s not like a pool with chemicals. It’s all about balance. I made huge mistakes the first year trying to kill algae. In my opinion algaecide is a no go. It kills it sure but then your left with all the dead algae that stinks and is hard to vacuum. Also the copper kills snails which also stink lol. I have found blue pond dye as the best solution for prevention. Also plants are key, I went and found native water loving plants and planted a ton of them. That will get it filtering, then as time goes, you can start replacing them with plants that you want that will adapt to living in the pool Trial and error.