That is the soiless products...foxfarm...check my journal out.....you can use them in either hydro or soil applications. No need to regulate water temps. It stays about 70 in my house at all times. I check the ph with my aquarium kit. If i needed to buy one it's about 5 bucks. I would prefer to invest in a digital ppm/ph meter, but so far it hasn't been a problem. Just change the solution every 2 weeks, check the ph and let them roll. I just start with low amounts and work my way up till the plant looks happy.