Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I like EC, but find it a bit expensive. I have used gravel from landscapes stores, and I like the fine ones, about 1/4" or so. Coarser is not much good.
I use a lot of montmorillonite clays. This is a baked clay product that holds the nutrients really well. It has high cationic exchange capacity. I have used several. Currently I am using Safe-T-Sorb.
The only reason to use magnesium sulfate is if your tap water is low in magnesium. Most tap water is not. If the GH of your water is under about 3 degrees, then you should use a complete GH booster.
GH is a measure of calcium and magnesium. Plants use about 4 times as much calcium as magnesium. Makes no sense to supplement the one that is used the least.
Do you need dispenser bottles? They look like good ones. I have used that sort of squeeze and measure sort for other things. Don't much like them. But that is just me.