GH booster recipe for 100% RODI water

[pleco4me]

My local water supply is on the hard side of the scale (KH 7-8, GH 12-13, TDS 300-350) and I am now using RODI water for a 60x45x45cm tank (net volume ~100L) to grow soft water plants like Syngonanthus sp. I am dosing EI and doing weekly 50% water changes.

Now, can someone help with a GH booster recipe to bump the GH of my RODI water from 0 to 3 degrees? I have MgCl2, MgSO4, CaCl2 and K2SO4 (not for GH boosting, but it seems to be a common additive in most boosters) on hand to make the GH booster.

Any help would be greatly appreciated

Cheers
Craig

 

[Tom Barr]

Blend with the tap water.

A KH of 3 would be about 60% RO water, and then the GH would be about 5.

Saves time, $ and then you can add warm tap to the RO blend.

 

[thegasman]

My tap water is even harder than yours. Like Tom recommend, I add about 20% tap to my RO water. Works great and no chemicals to mix up.

 

[pleco4me]

Thanks Tom and Gasman, I will give it a shot

 

[thegasman]

I forgot to mention that I do add some Seachem Prime to the mix.