I was wondering why my TA has dropped. Not in a panic here just wanting to learn.

We had 3.5 inches of much needed rain here yesterday. The below reading are from the day before the rains and today's reading. The SWCG has been off for three weeks and I have been adding Bleach as needed. I drained a few inches from the pool this morning and I always take the reading at night.

Before
FC 7
CC 0
PH 7.5
TA 70
CH 110
CYA 40
Salt 3110
Borate 50
Temp 62

AFTER

FC 4.5
CC 0
PH 7.5
TA 50
CH 110
CYA didn't test
Salt didn't test
Borate didn't test
Temp 58

With an accuracy of + or - 10ppm on the test, I would be reluctant to call that a drop. It may well be (from the rain) but my tendency would be to disregard it.

Ok, and thanks for the fast reply.