Thank you - that was the culprit. I just left it alone yesterday and re-tested tonight and my chlorine level was down to 6 and my pH just over 7.2, so I added a little more Borax through the skimmer. I remember Carl always saying to add sparingly, re-check after it has had time to circulate, then add more if needed; good advice. Between my pool rover plus, an occasional vacuum with my pool buster (yes, I learned about cool pool "toys" from Carl too), and a small dose of bleach each day my pool was very simple to care for this summer. It just threw me for a loop when my pH was reading sky high, so thanks . Even after my 3rd summer there's still things to learn. Temps are in the 40's now and will get to 30's with frost, water temp is in 60's and leaves are just starting to turn here; so glad it's covered up and ready to hibernate for the winter. Have a couple days coming up back up in the 80's so left my pump/filter running yet. Will drain soon and put away all my equipment and plumbing, then will wish for spring! Thank you again!