are mid grow flushes a must

I'd flush like once a month during the grow as a preventative maintenance measure(excess salt build-up).

I "flush" with pure spring water every week at res change, because it's a great thing to do when growing medical marijuana, and suggested by Dutch Mster Gold. 3 yrs, no issues ever, no deficiencies, no flushing chemicals. in the last two weeks (res) ppm is under 200(my natural water), then harvested.

I flush 3 times during the ENTIRE Grow.

VEG Bucket (no change 1-4 weeks)
** Flush 24 hours bucket clearex / RO Water **
Flower 1-22 day (no change)
** Flush 24 hours bucket clearex / RO Water **
Flower 23-43 day (no change)
** Flush 24 hours bucket clearex / RO Water **
Flower 44+ to Harvest (no flush no change)

pharmacoping said:

I "flush" with pure spring water every week at res change, because it's a great thing to do when growing medical marijuana, and suggested by Dutch Mster Gold. 3 yrs, no issues ever, no deficiencies, no flushing chemicals. in the last two weeks (res) ppm is under 200(my natural water), then harvested.

Click to expand...

Well Advanced Nutrients state that flushing with bottled "Perrier Water" especially the sparkling lime enhances bud triches, overall bag appeal and sprouts little tiny monocles everywhere so you can catch a ride to the next ride at witch mountain.

fortunately my spring water comes from my spring, near free.