Preservative

Mikrokill (Cap Gly. Phenoxy, Chlorophenisn is being added at 30-35°C. 
We are seeing an issue where the mikrokill is more concentrated at the bottom of the batch. This is a large batch ~500 gal. An O/W lotion with a viscosity of about 20k cps. Anyone seen similar occurrences?  Thinking the temp is too low? 
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