So, if you diluted as Ben suggested above, then you need to multiply the reading of 85 x3 = 255.

If it were my pool and I was able, I'd probably drain and refill a good bit of that water since you have a ridiculously high CYA. But, where you live there may be water restrictions. Wait and see what Ben's recommendation is for you.

But, get some bleach in there. A chlorine of 1 is an open invitation to algae. I'd probably put about 4 of the 121-oz jugs of bleach in there.