Have you looked into using a flushing agent such as Florakleen counts down flush time.
General Hydroponics FloraKleen removes fertilizer residues that can accumulate over time in hydroponic systems, growing media and potting soils. Use FloraKleen monthly to purge your hydroponic system or potted plants of excess salts that can accumulate as a result of regular fertilizer application. FloraKleen is an excellent final flush and can be used to dissolve mineral and salt buildup. Its high concentration and low price make FloraKleen the economical choice for maintaining your plants in both hydroponic and soil based environments.
Features
• Dissolves away accumulated fertilizer salts.
• Reduces excess and imbalanced fertilizers.
• Releases nutrient bond between plant and system.
• Use Flora Kleen as a final flush for one week before harvest.
• Safe for hydroponic systems and media while plants are growing.
Analysis
From MSDS: Flora Kleen Cleaning Flush Solution is a specially formulated mixture of chemicals that are mixed in proportions to assure adequate removal of nutrient residues. The chemical identity of the compounds and exact proportions used in the mixture are a trade secret.
Application
Hydroponic systems:
Between nutrient changes: Mix 1 to 2 teaspoons per gallon water. Use milder solution for young or fragile plants, stronger solution for older and strongerplants close to harvest. Recirculate in
hydroponic system for one to two hours. Drain and refill hydroponic system with fresh nutrient solution.
Final Flush Before Harvest: Drain old nutrient solution and discard. Refill hydroponic reservoir with fresh water and mix 2 teaspoons Flora Kleen per gallon water. Run this solution during last day or two before harvest.
Potting Soil & Soilless Mixes: Fill a watering can with fresh water and add 1 to 2 teaspoons FloraKleen. Drench until there is runoff from the bottom of the pot. Resume your regular fertilizer schedule with the next watering.
Read More About Flushing Agents Courtesy of Maximum Yield
