New pool owner - told to drain pool - Need advice PLEASE!

[kenfromtracy]

here is my pool store data from a week and a half ago.
I have added shock in the pool twice and added water since then
I am going to get another readout and I will post.

FAC = 0
TAC = 0
CH = 880
CYA = 21
TA = 80
pH = 7.8
TDS = 4200
Pho = 300

[PoolDoc]

1. Order a K2006

2. Take a sample of whatever water your fill your pool with into your dealer, and have them test it. Dealer tests aren't reliable, but a CH reading of 880 is not likely to be off by enough to make a difference. In particular, I'd like to see the TDS, phosphate, and CH results on your fill water. (If your fill water is not better than your pool water on those measurements, there's little point to draining.) Also let us know if water is particularly expensive, or if you are under any sort of water restrictions -- INCLUDING problems with having nowhere to put 19,000 gallons!

3. Read the muriatic acid page linked in my signature, get some, and lower your pH to 7.0 - 7.2

4. Get an OTO / phenol red drops kit from Walmart AND several gallons of PLAIN household 6% bleach. Add 2 gallons (about 6 ppm FC) in the evening; test your chlorine level 1 hour later. Test again the following morning. Let us know if it drops significantly overnight.