{TAIL ~ The water} contains a quantity of pollutants, nutrients or other undesirable species and has a pH on entry into {HEAD ~ the floway} such that the algae is not prevented from growing by an excessively high or low pH, and such that the pollutants, nutrients or other undesirable species are generally dissolved, although some species may be present in the form of suspended particulate matter 
{ TAIL ~ The water } contains a quantity of pollutants , nutrients or other undesirable species and has a pH on entry into { HEAD ~ the floway } such that the algae is not prevented from growing by an excessively high or low pH , and such that the pollutants , nutrients or other undesirable species are generally dissolved , although some species may be present in the form of suspended particulate matter
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