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I took my filter apart this morning to clean it and ever since I can't seem to get the manual relief valve on the top to seal all the way. I've taken the top back off and checked it from the inside and nothing appears to be wrong that I can tell. I've also played with it from the top side with...

I bought some of the BlueDevil phenol red (here: http://www.amazon.com/dp/B00DP5CSKW/ref=cm_sw_r_other_apa_DMbuzb2SMA9E7) to save some money by getting a larger volume but using the standard 5 drops the test turns bright cherry red, even on my tap water. Could the reagent be bad or do I need to...