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An FC of 6 is NOT "obscenely high". If your stabilizer level is anywhere between 30 and 90ppm it is within the normal range for maintenance, and, for shocking, it isn't even close to high enough.

Read the K-2006 directions. Fill the big tube to the 10ml line and add a scoop of the R-0870 powder. It should turn pink or red. Now add one drop of R-0871 (the brown bottle) and swirl. Add and count drops until the pink goes clear. If it still has a pink tinge (I set it on something paper white) add one more drop. Divide the number of drops by 2 and that's your FC in ppm.

You can buy refills for all the reagents. You don't need to buy a new kit each time, though the FAS-DPD powder test for chlorine is the reason to own a K-2006 vs a K-2005. However, that can be purchased separately as the standalone K-1515 to upgrade the K-2005.

Next, you need to read up on the relationship between chlorine and stabilizer. Go to our sister site, Poolsolutions.com and read EVERYTHING you can there. It's an education in pool care and it's free with no sign-up. Good Luck!