Hi Nancy,
Do you know what percent sodium hypochlorite your pool store chlorine is? If we know that, we can determine the quantity you need to add to shock your pool to the right level.
Your CYA level may not really be 100. 100 is the highest that the test can differentiate, so it actually may be much higher than that. You basically have two options:
1. Do a partial drain and refill and try and lower your CYA to a more manageable level. (Do NOT totally drain the pool, however.)
OR
2. Run higher than normal chlorine levels to compensate for the high CYA. (See the Best Guess Table in my signature below for more about that.)
You'll need a good test kit so you don't have to depend on the pool store. Plus, you need to be testing every day and several times a day when you are having problems. You're not going to want to keep making that trip to the pool store. The one we recommend is the Taylor K-2006 or 2006C (same kit, larger bottle of some reagents). If you buy it through the Amazon link in my signature, the Pool Forum makes a little money on the sale which helps us keep this form online. Only buy if the seller is Amato Industries, however. Some other sellers are substituting the K-2005 which you do NOT want. If Amato isn't listed, wait a day or two and try again. They seem to restock pretty quickly when they sell out.
Reply back with info about the LC and also which option you like and somebody here can help you go from there.
Welcome to the Pool Forum!
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