Hi Fred and welcome to the Pool Forum.
I assume you are using test strips since you report the CYA level as being a range of 0-30. If you have been using trichlor, then you have a CYA reading. Do you have a reputable pool store that you can let test your water and report back with their numbers. Just don't let them talk you into buying a bunch of stuff.
You'll need a good test kit if you don't already have one. 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.
Tell us exactly what all you have put in the pool meaning ingredients and not product names. Then somebody here can try and help you.
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