Pond Boss Forums GENERAL QUESTIONS Water chemistry Should I lime my lake

20 is low, definately. The recommended range is 20-200. pH could be higher too, but that all depends on what time of day it was taken - with that low alkalinity, it will swing greatly from sunrise to noon to sunset. I'd definately have it on my "to do" list, but further down the list than making sure I got enough LMB removed.