Quote Originally Posted by Weedhound
Can't get us to agree on anything...:wtf:...while those folks are correct technically.....I'll still bet you 50 to 1 that if what you have in there now won't hold it.....then it ain't going to hold worth your time and energy even with tons of other crap. It's great to say you can just keep adjusting it....which you can.....but it takes it's toll on both you and your plants. Yep I don't like to haul water around either.....but I DO like plants that grow....not simply continually recover from shifts in the ph (btw....the EXACT issue I just got rid of when I dumped my hydroton.) That, however, is simply my opinion on the subject.
WH, yer almost certainly correct- and hauling water is way better than constant dosing. Feel free to tell me that you told me so

Hydroton's pretty stable once you've used it for a while, as is RW. Both will buffer high for a while, though- w/ the RW, you usually have to soak it in a 4.5-5.5 solution for a while, and the hydroton... well, some bags have been good to go, and some have required a pretty good break-in period. Stuff I'm working w/ now is nuteral like glass- but some of it's a decade old or more...

I dunno, I'm lazy- I hate hauling water.

Anyway, Deja- see how it sits in the morning- whether or not it rises, and how much acid is required to bring it back down. Should take less acid each time ( or, conversely, same volume of acid should have greater affect).

You could also try filling the res w/ distilled, and seeing if it does the same thing, which would indicate media issue, not water supply. If it's media, you're going to have to either condition it, or, as WH indicates, move to a differant media.

WH- yer in Higromite, right?