What is your other dosing? What do you add for KH if anything?
Hi
@Wookii ,
This is my current dosing for my WC water (I front load everything for the week):
CaSO4.2H2O to target 36ppm of Ca.
MgSO4 to target 5 ppm of Mg
Mg(NO3)2.6H2O to target 20 ppm of NO3 (adds 4.5 ppm of N and 4 ppm of Mg)
and finally KH2PO4 to target 9.2 ppm of PO4 (adds 3 ppm of P and 3.8 ppm of K) - see below vs. K
Of course with the SO4 compounds come a lot of Sulphate.
I blend 20% tap with my Tap/RO WC water to target 2-2.5 KH (CO3). My Tap water is special as it comes out at zero GH... stripped from Ca and Mg due to our KCL resin based water softener - hence my tap water is heavily loaded with Potassium (K) from the ion exchange (and unknown quantities of Chloride) - likely in the 150-180ppm range, so the 20% mix gives me around 35ppm of K + what I get from the KH2PO4 above.
All in all the, math totally adds up to about 220 ppm (the 20% tap contributes about 80ppm, the RO is about 10ppm and the salts above contributes about 120ppm), so depending on how cavalier I am with my measurements of the salts I usually end up with somewhere around 210-230 ppm. (In addition, I add a few ppms of traces throughout the week - which is insignificant in the grand scheme of things).
This is the dosing I am planning:
CaSO4.2H2O to target 30ppm of Ca.
MgSO4 to target 6 ppm of Mg
Mg(NO3)2.6H2O to target 10 ppm of NO3 (adds 2 ppm of Mg)
and finally KH2PO4 to target 4 ppm of PO4
(About 6.2 GH from the Ca and Mg).
Instead of 20% tap I will reduce it to 10% which would get me around 1-1.5 KH and 20 ppm of K.
This whole exercise should, if am doing the math correctly, reduce the TDS of my WC water to about ~140ppm. (10 ppm from RO, 40 ppm from tap and 90 ppm from the salts).
Cheers,
Michael