How To Use Progressive Web App aka PWA On 420 Magazine Forum
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This is my 2 cents worth I use hydro and I don't bother with this topping, ppm or ph testing and I have had no problems what so ever, I change my tank every 2 weeks sometimes every one week depending on other factors and my plant is looking great, I did test my ph water out of the tap to check that, seems that's what I am using and that tested ok so I was happy but then again I am a poor man so cant afford fancy testers and just use stripe testers