[lemma=the] □
[lemma=the] [□]
[lemma=the] []
For good results , the alkalinity should be at least 20 parts per million . However , if the alkalinity does reach a critically low level , the pH of the water will drop rapidly and have detrimental effects on the fish and biofilter . If the sample is refrigerated , the alkalinity test can be performed within 24 hours . The alkalinity helps decrease the bacteria count because they like an acid environment .