LA Water Parameters and Mg/Ca Dosing

[SunnyD]

The EI dosing method mentions adding some form of "GH Booster" (Seachem Equilibrium, etc.), but I've found many posts suggesting that if your water is already considered hard, you can skip dosing it.

I live in West LA in Southern California, which supposedly has hard water. On the LA Water & Power website (http://www.ladwp.com/ladwp/cms/ladwp001965.jsp) I found the Annual Water Quality Report for 2009 (most recent).

Below are the figures from that report that should be relevant. I believe "mg/L" is the same as "ppm" and that "alkalinity" is the same as "KH".


Total Hardness (GH as CaCo3):
Range: 104-118 mg/L
Average: 110 mg/L

Alkalinity (KH):
Range: 92-106 mg/L
Average: 100 mg/L

Magnesium:
Range: 9-11 mg/L
Average: 9 mg/L

Calcium:
Range: 26-30 mg/L
Average: 28 mg/L

Based on the average GH and KH numbers above, I've calculated the degrees to be:
dGH: 6.1631
dKH: 5.6

So my question is given these numbers, is it safe for me to not dose Ca/Mg? If I change 50% of my tank's water, I will essentially be "dosing" Mg and Ca to 4.5ppm and 14ppm levels (at the very least). This should not be limiting right?

Sorry for the long post. I just wanted to make sure my calculations are correct.

 

[dutchy]

Hi,

With 50% waterchanges you don't need to dose any of these. The tap supply has good values.

regards,
dutchy