So my ppm is pretty high with the city water with the nuts I use puts me over 800ppm. So I was thinking of purchasing a water filter to cut down on the distilled water cost. But what about rain water? I haven't tested it but I would think it's ppm would be low and maybe there is some other benefits. What is everyone's thoughtful. My first thought is " Idon't want to bring anything from outside into my grow tent"
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We did 50 Huge outdoor plants on nothing but collected and contained storm water, adjusted pH as needed, used that water with nutes as well. Best free way to go. Just make sure the containers are very clean and sealable if yr going to store the water. Rock out growski.