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John5528
I see that some kind of slime keeps appearing in my aquarium, the red cyanobacteria has been replaced by green, I've dealt with all that... but now a brown film has started, it seems the issue is with the water... so please enlighten me about the final purification of the reverse osmosis, where to buy the desired resin and how to attach it to the reverse osmosis system (I understand that when filling the auto top-off, we pass the water through some vessel with resin)... in general, help.