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Both my pumps are at the bottom of the pond and so I would assume that this is the water being targeted for removal during water changes. I don't have a test here to accurately measure the amount of salt I need to add - is there any recommendation per litre I could add? I just put 2kgs of coarse sea salt into the pond. I usually use a fair amount of salt, but I've been concerned about Ph so have been sparing with it in the last week or so.
The water change seemed to make little difference to the nitrite level.
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