bunkerking
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Potassium sulphate maybe? That's cheap and easy to get. Then use combo of magnesium nitrate and cal nitrate?
Can avoid phosphorus that way but again would have to run numbers
remember GB Hydro has Ca in it (2-3% I believe).
Could be. Also the yellowing was prob from it dropping the PH in the root zone and locking out other things.
100-110 ppm of N (N03) max in flower. Think I run right at 103 ppm. 1:2ish N:K. 3:2ish- 2:1ish N:P and you are gravy. Hit that hwoever you want. Fewer bottles the better. As far as bloom boosters only one I would suggest is mag sulfate (epsom). I'm not a believer of PK Boosts.
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