I switched to bottled RO this grow and started with purchasing a 5 gallon jug and filling it at Whole Foods. $5 for 5 gallons, the grocery distilled was probably $7 - $8 for that amount.
The grow was going great and 6 weeks in I noticed that I could get RO at a vending machine outside a local store. Not going in the store was great and it was half as much. $2.50 for 5 gallons. A few days ago I was trimming her after a drain and fill and all of a sudden she fainted! Just starting drooping like crazy. I thought no way could taking off 4 fan leaves do this. Then I realized it was the water.
I found these 2 articles about Glacier water machines:
Luckily I had not dumped my drain yet. I put her on the bucket and went out for new water. By the time I got back she was already recovering.
So be careful and research these brands before putting them in the Grobo!