If your ppm is â??400" to start and it go`s down to â??200" it`s to weak !
if it`s â??400" and stay`s â??400" for some time it`s ok !
if it`s â??400" and go`s up to say â??600" it`s to high !
Start of low at say 200 - 400 ppm and just add moor if it drops over time
the ppm is FOR YOUR BASE N.P.K ONLY ! ! !