Agsil and CalMag ppm Confusion

BB Boomer

Well-Known Member
So I have searched alot of posts regarding the correct Agsil and CalMag doses per gallon of RO water but see some conflicts with what I am supposed to set each at.

I read on buil a soil website that the dosage for Agsil dry is 1/2 tsp per gallon but when I do my base water ppm is 300+. Is this correct? I am using it just for buffering.

On CalMag I read ppm should come out to 100 to 150 ppm. I only add 2 ml per gal. and it comes out to 130 to 140ppm.
Yet I have read where a number of members use 4 ml per gallon. When I tried that much I was getting a ppm around 300+.

Sure could use some clarification.

Right now I am using potassium bicarbonate for buffering and it works fine. Got some Agsil in yesterday because I heard it is better for buffering because it adds silica too.
 

BB Boomer

Well-Known Member
So I have searched alot of posts regarding the correct Agsil and CalMag doses per gallon of RO water but see some conflicts with what I am supposed to set each at.

I read on buil a soil website that the dosage for Agsil dry is 1/2 tsp per gallon but when I do my base water ppm is 300+. Is this correct? I am using it just for buffering.

On CalMag I read ppm should come out to 100 to 150 ppm. I only add 2 ml per gal. and it comes out to 130 to 140ppm.
Yet I have read where a number of members use 4 ml per gallon. When I tried that much I was getting a ppm around 300+.

Sure could use some clarification.

Right now I am using potassium bicarbonate for buffering and it works fine. Got some Agsil in yesterday because I heard it is better for buffering because it adds silica too.
Just to clarify, my ppm numbers are for the Agsil and CalMag themselves.
 

7CardBud

Well-Known Member
200 ppm is a good base for calmag. For AgSil, basic maintenace use is at 150mg/L. That yields about 30ppm Si and 50ppm K.
If you need additional buffering the AgSil will do the trick.
 

BB Boomer

Well-Known Member
Thanks so much. I will use the rates next watering. I thought a 1/2 tsp Agsil per gallon seemed high.
 
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