Donna, I suggest you shock your pool....1.5 or 2 or 3 or 4 gallons won't do it.

Download mwsmith2's bleachcalc from any of his posts...you'll use it all Summer.

What it will tell you is that to shock a 19,100 gallons pool with a CYA of 100 and with a current FC of 1.5.....you're gonna' need 7.5 gallons of 6% clorox.
Any less and you're tap dancing around your issues instead of stomping on them.

Now, since the large jugs of clorox are 1.42 gallons and you have a plaster pool, I suggest you put in 6 large jugs...all at once. That will raise your Cl to 28ppm (no problem) and will start to cure "chlorine lock" (which doesn't exist).

I suggest you put it in at dusk to be most effective and then test again the next AM before the Sun hits it. I'll bet money your gonna' lose a lot of Cl that first night. If so, you need to repeat the process the next evening and again the next. bringing your Cl up to 28ppm each evening.

When you hold Cl overnite (less then 2ppm loss) you can be assured the organics are cleared from your pool and you will start using far less chlorine. Maintain it from 5-10ppm from that point on.

What I think Tom is struggling with is not putting enough Cl to get to breakpoint. Without getting into details, if you'll put in those 6 large jugs, you will get to breakpoint and your pool will return to it's healthy condition.

PS- disregard TDS....it's normally not important and that test result was bogus, anyway.

Tom will probably be reluctant to follow this path and you'll have to make a choice. The one we're recommending here on the forum will fix the pool.