Chlorine Tablets Vs Liquid... Worth $700 for CYA?

My pool company said I have a CYA issue due to using Chlorine Tablets for a community pool. I read where the solution is to drain 1/4 of the water for 4 weeks and then you are good.... Anyway they are proposing a switch to liquid chlorine for $700 to fix the issue

1-Is switching to liquid chlorinator system the solution
2-Is around $700 the correct price?

Hi!
While we are not a community pool forum, Ben (PoolDoc) has managed many of them over the years.
CYA is stabilizer and an "issue" means it's too high. But how high IS too high? Without a measure we cannot tell. The easiest way to lower CYA IS by dilution, but that's a straight-forward relationship. If your CYA is, say, 200ppm (which IS 'way too high!) draining and replacing 1/4 of your water should get you to 150ppm, still 'way too high.
Liquid Chlorine is....bleach, just a stronger concentration. I buy 12.5% LC for less than $2/gallon. 1 gallon will raise the chlorine level in a 10,000 gallon pool 12.5ppm, or 1/10th of that in a 100,000 gallon community pool.

So how big IS your pool?