If "CY" = CYA or cyanuric acid, your chlorine levels aren't nearly high enough. Read the "Best Guess" page linked in my signature. Also, it shouldn't take $2500 for an SWCG -- you can purchase a complete Pentair IC60 + powersupply at a1poolparts.com for under $1,000. I'm not necessarily recommending them, but I've gotten 5 units from them in the past 60 days. However, I wouldn't go that route, till you've resolved your pool problems. A SWCG is just a *method* of adding chlorine.
Do this:
#1 - Add 4 gallons of plain 6% household bleach as soon as you can (~10 ppm)
#2 - Purchase a cheap OTO/phenol red drops testkit locally. Usually, you can get one at Wal or K-mart.
#3 - Read the Best Guess page.
#4 - Order a Taylor K2006 or 2006C testkit. You can use the Amazon link in my sig. When the seller is "Amato Industries" the price is as low as I've seen, and they consistently ship the correct kit (others sometimes sub the cheaper K2005).
#5 - Till the K2006 kit arrives, use bleach to keep your pool in the DARK yellow to light orange range on OTO (10 - 20 ppm)
#6 - Brush your pool and run your pump 24/7
#7 - Post back once you have the Taylor results OR if you have some sort of problem.
The chlorine 'demand' (usage) you are experience can be several things, ranging from beginning algal growth, to various additives such as cheap algaecides or other 'booster' products. With your stabilizer that high, high chlorine levels are required to kill things, and keep your pool from becoming a mess. You can swim safely and comfortably at those levels, but don't wear new expensive swim suits.
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