My ppm of my tap just came out to be 43 ppm & the distilled was 3 ppm so definitely switching to tap I just wasn’t sure of harmful things being in the tapExactly what you should do . I use tap water . I let sit for a day or two . I ph it to a 6.3 -6.4 AFTER . adding my fox farm trio nutrients , cal mag . I use fox farm ocean soil. I love it . Loaded with nutes , just add water for a bout a month . After that add nutes . I don’t get why it catches so much flak . Super user friendly .