I use API master kit, API phosphate and API GH/KH kit. There are better ones out there but many of them are more expensive. Once you get things where you want, you really won't use them very often anyway so I went the cheap route and what my LFS happened to have in stock.Hey people,
Im a lowtech guy and I want to get into co2 and ferts and I don't know of any good test kits for the job. What do you guys use?