PPM goes rapidly UP into flushing. Use of HydroGuard while flushing is tolerable?

ppm won't rise due to microbes. Bad microbes could cause what you see in the res and sad leaves, though. A little h2o2? chlorine? Better google how to clean up your res. Looks to be nearing the end, eh? I wouldn't do anything drastic, if so. A flush late is only going to hurt yield more than benefit, most liekly. If canopy is strong with minimal fade, go for it, i guess? Sometimes giving in to the OCD has it's theraputic benefits. I'd get the grime under control, but not 100% sure it's the best idea.

Hello.. Hope you are well.. It will b any build up nutes left in ur root system after flush.. Try swilling out roots nxt time u flushing.. Are u on final wk im assuming.. Ur ppm is a bit high tbh.. I use nothing but plain ph'd tap water in final wk.. It will try to raise but the more u clean out res n roots etc the better ur ppm will keep stability.. Stay safe n gud luck.. 👍🍀