Cal-Mag in CO tap water?

Hello all,

First post to Rollitup, and I have a question regarding supplemental cal-mag with tap water. I've read around and seen people say that in certain areas, if using tap water, there should be no need to add cal-mag, HOWEVER, I do know that in CO, our tap is pretty clean, so I've gotten my city's water report, and this is what I've got:

pH 7.7
Total Dissolved Solids (TDS) Est, ppm 53
Electrical Conductivity, mmho/cm 0.09
Cations / Anions, me/L 0.7 / 0.7
ppm
Sodium, Na 6
Potassium, K < 1
Calcium, Ca 7
Magnesium, Mg 1
Total Hardness, CaCO3 22
Nitrate, NO3-N < 0.1 (SAFE)
Sulfate, SO4-S 5
Chloride, Cl 1
Carbonate, CO3 < 1
Bicarbonate, HCO3 24
Total Alkalinity, CaCO3 19
Total Phosphorus, P 0.81
Total Iron, Fe < 0.01

I will of course be letting the chlorine gas out, and bringing Ph down, so if I can use my tap water for Cal-Mag, I'd be pretty happy with it. Thanks for any help and response,

-Si

Should be fine. Might need mg later in flower. Just my two cents

Hey bro I'm in Colorado as well in Denver. I have bought a bottle of cal mag. But it really doesn't get used because my plants never show cal mag deficiencies. I would only use if you see your plants needing more of it.

Mire said:

I will of course be letting the chlorine gas out, and bringing Ph down, so if I can use my tap water for Cal-Mag, I'd be pretty happy with it. Thanks for any help and response

Click to expand...

I use tapwater with 100% coco coir and a balanced generic fertilizer with micros. I grow as if it were a drain-to-waste hydro, with daily watering and the coco is always moist. About my only problem is bugs, and if I get anything that resembles a mineral problem it's magnesium and adding 1/2 teaspoon of epsom salts per gallon to one feeding every few weeks controls it.

On my next grow (probably starting right after New Years if these sativas ever decide to ripen) I'm going to try using a tablespoon of dolomite in the bottom half of the coco in each planter, to see if I can get rid of the epsom. If I can get my wife to agree, maybe I'll journal it with photos and a video.