cell

I heard from many people that I need to add Equilibrium to my R/O water, it raise the GH and adds minerals to my water. Since the GH of my tap water is around 16, I use R/O water and its GH is around 5. Let's say I'm satisfied with a GH of 5, is Equilibrium still recommended/useful in my case?

Seachem

If you are satisfied with a GH of 5, then you do not necessarily have to use Equilibrium. As far as general hardness is concerned, plant preferences will vary, but a general guide is about 1–2 meq/L (3–6 dH) or to match the existing or target carbonate hardness (KH), which, ideally, is also about 1–2 meq/L (3–6 dKH).

Newt

You should check your water source for what is actually in your water as far as Calcium, Magnesium, Potassium, Iron and alkalinity. My water source has NO potassium and very little Ca and Mg and the Mg is very low. You may be deficient or too high with one or more minerals which can cause uptake of other nutrients.

http://www.finostrom.com.gr/images/a...lizers/map.htm

Seachem

Thanks for the post, Newt