PH won't go down???

Ok so my seedlings have PH lock out at the moment and its because the PH is obscenly high, something like 8.5+ and I have NO CLUE how it got that way.

I've been flushing them for the last half hour or so and the ph just won't drop, and I have no clue why. They are in a manure/perlite mixture and I've been flushing with water ph'd around 6.8, anyone have any idea as to why the PH is staying constant at such a high? I've probably run nearly half a gallon through each of them already and they are only in regular sized plastic cups...I'm seriously stumped here.

whats the ph of the water you are using....oops you answered that question already. No clue.....sorry I couldn't be more help. :(

It's np, I'm fairly knowledgable about PH since I did battle with it the first time I grew, but that was the ph being too low. This just has me confused as hell.

Problem seems to have cleared itself up...I guess they just needed a REALLY aggressive flushing.

Glad to hear that. Hope that's the end of it for you. :)

Are you sure it's a problem due to pH lockout? How old are your seedlings? Have you begun to fertilize them? If you're pH is not so far in either direction to cause harm to the plant, it's probably not lockout. If the seedling is still feeding from the cotyledons, then the pH is not as important. pH is primarily important for the plants to properly take in nutrients. If they don't need the nutes, it won't matter.

Like I said in my original post, the run off was something ridiculous like 8.5 ph. I'm pretty damned sure that was ph lock out. They are in a mixture of perlite and manure which I flushed all the nutes out of and the necrotic spots weren't just on the tips of the leaves, they were spotty all over the leaf along with a slight yellowing of the leaf...looked EXACTLY like the symptoms of the Ph lockout I had experienced on my first grow.

Still have NO IDEA what caused the PH to shoot up that high though.