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"What do I do? Dump my batch again? This is really getting old... I thought I could keep my nutes longer than a week..."
for what it is worth, I am 5 weeks into flowering now using a 4 bucket dwc system + 14 gal reservoir and have not had to dump/change my reservoir since I started this grow including veg time. I top off w/ pure RO all week and adjust nutes back up 1350 - 1400 (.7 conversion) on Saturdays. I dont have to add much micro and bloom to keep it at the 1300 - 1400 level (1000 or less in your case @ .5 conversion).
I have yet to need to add PH up or down. Mine stays between 5.4 - 6.1 all week. It climbs during the week while topping with PH 7.3 RO then drops when I feed micro/bloom on saturdays. Lucas claims that the PH swing from low 5's to low 6's is good for the plants to be able to uptake their needed nutrients.
with this being said, I have found that with the Lucas feeding schedule using GH micro/bloom, I have to add a pinch of epsom salts to the reservoir every couple weeks to keep from having magnesium def. I add 1ml per gallon in the system. I disolve it first in a gallon jug then pour into the reservoir. I have a magnetic driven water pump that re-circulates my nutes through the system and the magnet in it attracts my magnesium....lol
regards,
linedrivr
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