Jack's Classic Professional Calcium Nitrate, 15.5% Nitrogen 18% Calcium, 25lb Bag

great product. great results. great price, a little goes a long way.previously my double ended lighting an co2 enriched environment was causing my plants to consume themselves. i could not keep up with using a general hydroponics micro/ bloom ratio. since using jacks when i apply to nutrient reservoirs i use equal parts jacks hydroponics to jacks cal nitrogen. I run it about 300 ppm less then any GH product i ever used. 400-500 ppm preveg, 700ppm mid veg, 1000ppm late veg early flower. 1200-1400 after day 20 to flush. .5 conversion. 1250 ppm co2. beautiful

I use this in mu hydroponics system this is the largest bag I was able to find for sale on the internet at such a reasonable price, 25 lbs for 79.99 with free shipping.

Used this product in combo with other Jacks product to fertilize an indoor hydroponic garden. Outstanding results.

Great price only real issue is the bag I got is still dyed blue and I seen a video from 3 years ago talking about how it used to be blue and no longer is which tells me that the bag I got is probably at least 3 years old but cant be sure asince there is not a manufactured on date or experation date anywhere on the bag not really sure on how long it is good for hopefully it still works

Great nutrient at a great price. I use the 3-2-1 recipe.

Works great.

Great product, easy to use and very cost effective

jack cal-nit is excellent. best used along side jacks 5-12-26. everything you need for Fat healthy flowers.