WillMcK Posted May 5, 2021 Share Posted May 5, 2021 Is it safe to top off my outdoor mini ponds with collected rainwater from a rain barrel? I've read conflicting advice on the internet about rainwater having a dangerously low pH. But what about when it rains? If you top off with a hose, then is it okay to top off then immediately dose prime? Link to comment Share on other sites More sharing options...
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