MrSalvage
I mixed the MG in the box per instructions 1 tbsp-1 gallon of water and tested it with my PPM meter and it measured 885. I then continued to mix it stronger, filled the bottle with it till I got close to that measurement and finally quit when it reached 366. I'm not sure if that is a smart idea to mix that much, I'm worried it might kill the plant but the test show otherwise.
I was trying to get close to what the prepacked bottles measured and that was 519 using the feeder as directed but stopped when I got tired of removing the bottle, remove the cap, empty, add more MG, mix, refill the bottle and test it again.
FYI, I didn't mix it in a gallon container, I used an empty Coffeemate creamer container which is a little less than a half gallon so you should be fine mixing it in a gallon container, that will make it weaker.
Like Salsacharley I too tested how much water run through the feeder it takes to use all the fertilizer and I came up with 40 gallons. I mixed some red food coloring to do the test. So if we go by volume then it should take 40 TBSP for the recommended mix but using half will be closer to what comes in the bottles.
BUT....The blue mix is twice as strong as what comes in the bottle and that's what has me scared to use it at that strength.
I did use the final mix at 50% strength on my tomatoes and they're still fine. When I say 50%, I mean I filled the bottle 1/2 with the mix and 1/2 with water.
So basically I wrote all of this to say that if you use 7tbsp in the feeder the plants will be fine
