I'll have to look and see, but is this a continuation of another thread? If so, I'll try to find the other thread and merge these posts.....from here on, if you want to continue a current thread, instead of starting a new one with each post, just hit the reply button on the last post in the thread, and type your new post--that will keep all the posts about one pool together in one thread and be much less confusing.

As long as you're using trichlor, you are driving your pH down, and that can be damaging to your liner. The trichlor tabs will raise CYA, but slowly. However, they will drive your pH down in a hurry. You need to add more than a couple of tablespoons of Borax, because if your kit reads 6.8 and that's the lowest pH it will read, it actually means 6.8 or lower. I would start with a cup or two of Borax, add that, see if the pH moves, and then adjust accordingly.

You really need to adjust your pH up as soon as possible, and then either keep a good eye on it and add Borax as necessary to keep it above 7.0, or stop using the trichlor and switch to bleach and manually added CYA.


Don't worry about your TA, it is not really high, and in a vinyl pool with trichlor tabs, it really isn't going to make any difference.