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No, but where i live the ph of the tapwater is 8 or above. There is so much calcium that the bottom of your cup of tea has visible chunks of calcium! I have been using vinegar but it seems that phosphoric acid is the official way to acid up your water.

Thanks for the link, lots of good info in there :)

Why is it a stupid post? - i am making a ph down solution, and 85% phosphoric is considered a medium strength acid. I have never mixed 85% phosphoric acid with water before, so am trying to plan things out in advance. Youtube clips are always using a pyrex or stainless container, but i plan to...

Thanks for the replies, so regarding the UV - in a 4x4x6 foot tent, how many watts of CFL UV should i use? (i have bought some UV400 rated sunglasses, but will still be very careful because you never know how truthful the rating is)

How much heat will result from from slowly pouring 250ml 85% phosphoric acid into to 1700 ml ph-8 water? Is it enough that its likely to melt a plastic (PET) homebrew bottle ? - (yes of course the mix will be labelled poison and not sit in the fridge duh :) ) Will i need to go outside to do...

I am doing a 600w MH/HPS 4x4 coco tent grow, with a 6" centrifugal/carbon exhaust. 4xGG#4 + 2xWW photo. I have indoor/lights experience from 15 years ago, but the science has obviously improved since then, and yields are massively higher. Plants are currently at seedling stage, and im hoping to...

Hi everyone! Im Mildew and i have been off the weed for 3 1/2 years :( Wanting to get back into it, so i have set up a 4x4 600w coco system with 4 GG#4 and 2 White Widows (photoperiod) . I did heaps of 400w MH/soil SOG growing about 15 years ago (great weed, terrible yields), but standards have...