Quote Originally Posted by Rusty Trichome
HortFACT - Soilless Media in Horticulture
Promix is not a hydroponic medium, and I wouldn't be aiming for the more acidic numbers that were being thrown out here.
Treat it as if it were a soil mix.
Nothing to fear with a flush, it's just another step in growing. Salts and nutrients build-up, which will lower your ph over time. Be careful of keeping the soil too wet for too long. (don't water just before a flush, nor just after. Can cause root rot.)
I add my nutes into the final 1/2 gallon of flush water, then let it be for a few days till next watering.
HTH...
Rusty,

according ot the link you provided, they state that Promix 'is' a soiless medium. Should you not aim for a ph level of high 5's with soiless mix?
faceto27 Reviewed by faceto27 on . Need help with nutrient lockout Hope somebody can clear this up for me. I am almost 100% that I have nutrient lockout and that it is being caused by a ph problem. Sorry I don't have any pics to show, but from what I've seen and read, I am sure it is a nutrient lockout. I have 8 plants. 3 of them have burnt tips and edges and turning yellow. 2 of them show an Iron deficiency, and the other 3 look very healthy. The medium I am using is Promix. I water with regular tap water, the ph on the tap water is 7.2 to 7.3. This Rating: 5