Most municipals use different types of chlorine most in gas form. Letting the water sit in open containers for a day or so allows the gas to escape or gas off. Most water contains magnesium, calcium and iron that is needed by plants. If you filter these out you have to replace them with other nutrients. But by using nutrients so to replace them. You have better control of these substances. I use municipal water that I allow to gas off with a PH of 8. And use citric acid to bring the PH down in my organic grows. But in my Coco grows with synthetic nutrients I used straight tap water when I flushed. Most of your flush products contain chlorine so to break down the salts. With the last gallon per gallon of coco gassed off and PH adjusted so to rinse them. When just starting out with multiple plants. It is good to experiment with different methods on individual plants and take the path where the plants lead you. You do not have to hit a home run right away. Take advice even mine in forums with a grain of salt. Try this and that. And after a few grows you will form your own opinion on what is right for you. But use the forums as a guide. Take care.
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