Alkalinity is normally measured in dKH or meq/L. I am not used to seeing it in ppm so I just did the conversion a minute ago and 300 doesn't sound right. If you are correct and it is 300 ppm then that converts to around 17 dKH, which is very high. Strip tests are notorious for being not only inaccurate but difficult to read. The next time you visit your LFS plaese take a water sample and have them test for alkalinity and compare your results. Salifert makes a decent alkalinity test kit.
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