You need to raise your pH to the 7.2-7.8 range, and quickly--anything below 7.0 can damage your liner. You can use 20 Mule Team Borax for this. Your Alk needs to come up to the 80-120 range. Baking soda will do this. However, you can raise both at once by using soda ash (Washing soda). You also need to get some chlorine in your water, approx 1-3 ppm for now. Add stabilizer, enough to shoot for 20-30 ppm, added either in the skimmer or in a nylon or tube sock tied in front of a return (don't retest or backwash for a week, since it takes a LONG time for it to dissolve). In the meantime, you need to test for and add chlorine daily, since with 0 CYA the sun will consume all of your chlorine.
Janet
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