I personally hsve successfully treated that promix pH drop problem with a combination of calmag to slow the drop and frequent repotting to pre-empt it. Works for me. Individual results may vary ; )
stinkyattic Reviewed by stinkyattic on . the form is filled out E-indoor or outdoor - indoor E-soil, soilless, coco, aero, or hydroponic -soilless E-specific medium CSL-Soil type/brand - promix bx HCL-Hydro/aero/soilless system type -3 gal pot ? SCL-Anything you have added to the soil - no SCLR-Soil or slab runoff pH E-Water source - tap E-Source water pH - 7.1 from the tap adjusted to 6.4 HRT-Source water EC (if hydro) Rating: 5