What should be the correct ppm of my fertilizer if I am using RO Water?
Hi I recently bought some of your 10-8-22 mixture. I mix about 10 gallons into my nutrient tank. I check with my TDS meter and it is nowhere near the right amount. I mix 1 tsp per gallon with 1/4 tsp epsom salts. Using this amount, what should be the ppm? What I am asking is if you mix 1 tsp of 10-8-22 with 1/4 tsp of epsom salts into 1 gallon what should be the correct ppm? I am getting below recommended level. I’m using reverse osmosis water because my city water is pretty hard. Can you please give me advice as to what can be wrong? Currently I’m using about double the recommended nutrients just to get about 1000 ppm. I’m afraid I’ll kill my plants soon. Thanks for any help. Keith Dear Keith, It is kind of a “rule of thumb” that 1 pound of fertilizer dissolved into 100 gallons of water should raise the conductivity by 1200 PPM. 100 teaspoons of our fertilizer is roughly equivalent to 1 pound. Therefore, if you are adding 1.25 teaspoons per gallon, I would expect 1.25 x 1200 = 1500 PP
