PM, the best prices I've seen for ph/tds meters are through internet fish/aquarium supply stores.
Crusinjimbo Reviewed by Crusinjimbo on . Help. How often should I or should I change my reservoir water. How often should I or should I change my reservoir water. I need to know this because I plan on starting a crop of 6 plants this week. I'm a noob but i've been reading the threads, but I just can't seem to find the answer. Much help would be appreciated. ~PM_BigBud~ Rating: 5