Why does the ph drop from 6.2 to 4.9 with in a day !?!?

Guys, if the h202 is 'saving' your plants then you have environmental problems, i.e. your nute temps or watering intervals or water quality is off.
There is nothing wrong with h202, just keep in mind it wipes out all the beneficials as well and you will have to do it ever 2-3 days. And it is rather expensive .
I would use it as an emergency while I figure out my environmental issues.

Kind

Refusedpanda said:

So the NutriPlus nutes are junk? I have two boxes full of nutes from them I got at a show. I was going to use them next run, but if that shit is causing problems I will just give that stuff away.

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I don't think Nutriplus is junk, it's just that Canna is top notch and it made a difference in this case

I'm having the same problem with ph going from 6.1 to 4.9 in a day. I'm running a waterfam drip system with a air stone in the res. Ppms are are ok at about 800 or so. Roots are hanging in the res and are super white and nice. Was wondering if the water coming from the drips are leaving nutes behind on the clay balls thus returning straight water back to the res causing the ph drop. Anyone have this problem? The plant looks super healthy and bushy and green. What I did was disconnect the air line to the drip ring and just leaving the air stone on with the roots hanging in the res, gonna let that go like that for a day and see if my theory is right. I'm using GH nutes using the Lucas formula with floralicious Plus as the only additive. Any help would be greatly appreciated.

OK update, I disconnected the drip ring and just running the air stone and the ph is holding at 5.98 this morning. It was 5.99-6.0 the night before. So I think I have the problem fixed

Jey i know this is a late reply but for anyone who still needs help.... 1 word........ algae. If your plant sites are not protected from light they will grow algae and that algae will make its way back to your reservoir. It doesnt take much to make your pH crash from 5.8 to 4.9 in 24 hours. If you have a venturi pump in your res like i do, instead of using air stones, that pump filter will grab all the algae and pump water through it making the pH crash. Clean the pump filter and lower your water level by an inch so that when the system floods it doesnt reach up to the algae, then clean what algae you can off the top of each site, rinse with dilited peroxide (cant remember the strength) and you're good to go. I've dealt with this and was able to fix it WITHOUT dumping the reservoir. If however, the pH changes in your reservoir without cycling then theres a good chance you have a pathogen in the system somewhere and the whole thing (reservoir, hoses, pumps, buckets, everything) needs to be purged and flushed with peroxide water, then rinsed, then you can refill. I hope this helps someone. Happy growing, friends.