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Aluminum sulfate is available on Amazon

He's trying to lower his ph, lime will raise it.

I read most of the posts and didn't see one of the biggest advantages of Diatomaceous Earth is it's a great source of silica, Doctor Bugbee loves silica, didn't mention Diatomaceous Earth but said vermiculite is a great source for silica yet when I google is vermiculite a good source of silica...

I have the e720, thinking of buying the controller, just 300 is steep, I had power out for 2 hours yesterday, scared the heck out of me, I very seldom have a power outage but if something like that ruins my first grow I would be pissed, not sure why the controller would do that and would be a...

1st time grower, what does paper bag sweating mean, how do you do it and why after drying and before Grove bag.

First comment on board, having the same situation, 5 x 5 grow tent, using different company co2 bag, the XL bag is not overkill for a 5 x 5, my concern was if I'm trying to exchange the air every minute or so in the tent I'm sucking out the co2 in the tent and replacing it with outside lower co2...