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Discussion Starter · #1 · (Edited)
PH & ORP Monitor, Why would I need ORP

I'm about to purchase a PH monitor to keep my PH levels consistent in my planted tank. Also on the market are combo PH and ORP monitors, but I'm not really sure what ORP is or why you need to monitor it? I believe it applies more to saltwater than freshwater but could someone comment and clarify this for me?

Thanks in advance,

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