How do I leach my rockwool system when the EC is too high?
First of all be sure that EC in your nutrient tank is the culprit. Compare EC values in your slabs or blocks to that of the solution. If the EC in your rockwool is significantly higher than that of your tank, you probably are irrigating too infrequently or your solution pH has gotten way out of whack. If both the tank and rockwool values are elevated you should reduce you tank EC via dilution with distilled water, adjust pH if necessary and then flush the system several times to bring down EC in the rockwool and prevent further damage to the plants. Once you bring down the EC in the rockwool into the proper range, immediately change to a fresh nutrient solution in your tank and be certain that both the EC and pH are in the correct range.
