I made 2 batches of Revs water, 1 with aquarium water and 1 with just dolomite, both as per Rev's ratios and then a 2nd bucket of dolomite water, all bubbled for 48 hours.
In all 3 instances I had to add a bit extra dolomite to get the ph right which took all 3 to 80ppm.
I figured if 80ppm meant the plants would eat the water then its ok because the ph was in check to accomodate, and if the rhizospere ate the water then the ph was irrelevent so either way it shouldn't be an issue.
I only had 3 durbans growing, all about 6 weeks into a 10 week flower. 1 was my final small pot test, a 1.66gal smart pot so It wasn't included but the other 2 in 6gal smart pots were used to try.
I gave one pure RO and the other got a rotation of all 3 buckets of Rev water. I noticed no difference between the 2 6gals.
I wasn't really expecting a huge plus to arise, I was more watching for a problem to arise. Both finished at 10 weeks and I couldn't see a difference at all, so I would say that 80ppm is safe, at least in larger pots.
The 1.66gal wasn't so lucky.... at 8 weeks it ran dry on nutes, which I actually consider a success as it only got RO water and fish ferts.
The myco survived to the end but the plant finished wispy and fluffy. It never got to do that sweet final chunking up.
Sorry girl
.
Its still hanging untrimmed and will end up as worm food.