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Grow QuestionsTap Water PPM

Tap Water PPM

calamitanstarted grow question 2 years ago

What PPM does your tap water come out at? Mine comes out at 380 with a pH of 8.5. I’m pretty sure that means I don’t need to use any Cal Mag.

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Feeding. Chemical composition

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GrowingGrannieanswered grow question 2 years ago

How in heavens name do you know the ppm includes calcium or magnesium? It could have a ton of iron in it .. My tap water sits just above 200ppm ... and the pH is 7.5.... and what that means to ME is that I have to add a whole lot of pH-Down to get it where it should be... I don't do anything about the ppm... nothing to be done except to work with it... Mix your nutes, adjust the pH and see how your plant reacts.... you might need less nutes than is recommended or you might need more... your plant will tell you - but if you know your water has a lot of chlorine in it, you'll need to filter that out... Good luck

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calamitananswered grow question 2 years ago

@Growing Grannie that’s actually a great point, where I live is basically a giant iron mine in Michigan’s Upper Peninsula! I’m gonna consider investing in a test.

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Ezzjaybruhanswered grow question 2 years ago

A high EC/PPM from the tap obviously means there’s minerals already in it. Often it is majority calcium and magnesium depending on the source, but you never know unless you get it tested or have access to city water reports. Frankly tho, 380 is quite high and I’d probably use RO if that were my situation.. I’m at about 110 PPM personally

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GrowCNanswered grow question 2 years ago

I sent a sample of my water off to be tested. The test was inexpensive and I got a list of all the minerals in my water and it was a good opportunity to verify my home test results. In my case I am lucky as the water did have a good amount of calcium and magnesium.

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ClydeGrowsanswered grow question 2 years ago

Mine is around 30-50ppm, very low. I would be leaving it out in the air for at least 24hrs to dechlorinate, and you don't want to assume that any of those minerals are what your plant needs. If you're growing in coco, you should always add some calmag. If you're in soil, you may still need some calmag but just give as needed. Your soil should also buffer any of those trace minerals in your tap water if you don't have a way to filter it (but a Brita filter will do!)

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Robertsanswered grow question 2 years ago

You need to filter out chlorine. And mine is about the same I used calmag before and after I started filtering my water. Why would you think you don't need cal mag. It is loaded with minerals and chemicals to make it safe to drink. Not sure where you got this from, but I would not listen to it.

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