I too use a similar method. I dip all my plants in the same 5 gallon bucket although I change the water after about a quarter of my plants have been through it. Two to three times a year I put a systemic fungicide in the water as a preventative. This is one of the ways I try to isolate and then rid the new shoots of the old fungal issues the plants usually come with. It works fairly well. In my collection I have few problems with fungal attacks although the older pbulbs/leaves/roots do have issues but these are dealt with in different ways. Virus is the main issue I face. Not much I can do about it.In my GH there is no other way to water. I buy RO water at retail stores by the gallon and transport it to my GH where I blend it 50/50 with city water. And in my ragged collection there is nothing sacred.
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