it is another name for stabilizer. If you have the Leslie's DPD test kit has a CYA test, you need to run it to find out your level. That kit is the same as a K-2005, so you need to add the FAS/DPD test to be able to test above 5
Your pH needs to come down, but that is just about the only advice I can offer without more tests. CYA and proper FC readings specifically. 5-10 is not nearly accurate or precise enough and one of several reasons we do not like test strips.
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