Fishyman6611 Posted July 22, 2022 Share Posted July 22, 2022 I have a 300G pond and I was told that if you are changing water directly into a pond or aquarium that you should treat the whole tank or pond with the declinator equal to the tank size. Can a partial water change like 20% be done untreated? Link to comment Share on other sites More sharing options...
Gwallace Posted July 22, 2022 Share Posted July 22, 2022 Do you have chlorine or chloramines? If the answer is "yes" then you need to treat the water. I always keep Seachem Safe around for the big tanks and ponds...it stretches way farther than the liquids...And yes, always treat to the tank/pond size. 1 Link to comment Share on other sites More sharing options...
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