Renting a house with 380 gallon hot tub which was previously maintained by homeowner. Extent of homeowners maintenance consisted of blindly adding bromine tablets and MPS weekly and monthly taking sample to local pool store. Now testing TF 100 and found following parameters:
1. CH 60
2. TA 0
3. pH below 6.8
4. Br 1
I used pool math and in attempted to raise TA to 50 by adding 4 oz of baking soda. However TA still reads 0.
Should I keep adding baking soda or empty hot tub and refill with fresh water and start from scratch?