Your ppm's increase due to a build up of nutrients in the growing medium. Your plants NEVER use 100% of the nutes in the soil.. so some of it will dry up and stick to the soil and remain there untill the next time you feed.. then the process repeats and over time the salts will build up to toxic levels. The reason they build up is BECAUSE you are not feeding straight water once in a while. Pretty much every plant food I have ever seen recommends feeding straight water ever 3rd feed if you are using a soil type medium... this is done to keep the salts from building up in the soil... Either way.. give them a good flushing.. like 50-60% runoff with straight ph'd water.. and the next time you feed.. you should notice a big improvement in your ppm's.. cheers!
XXXJAYXXX Reviewed by XXXJAYXXX on . Advice for rocketing ppms My garden is in about week six of bloom. Things were going well. Then, ppms began to rocket. I keep flushing and using nutes at 800, but rates keep rising. Is this because the plants are using lots of nutes and puking out the salts, or do I have some hidden issue. Current ppms range from 1200 to over 3000! Any help would be appreciated. Thanks in advance.:wtf: Rating: 5