Bloomington is considering applying a chemical called PhosLock to the upper pond, Comments?
The City of Bloomington would like to improve the aesthetics in the first of 5 stormwater retention ponds located in the heart of Bloomington. The first pond (8 foot max depth; ~1 surface acre) is intended to be a “reflection” pool but it suffers from a thick scum of algae in the summer. This pond flows into a succession of other ponds planted with emergent aquatics for bio-retention, before the water flows into Cascades Creek.
The City is considering applying a chemical called PhosLock to the upper pond to tie up phosphorus. Alternatively, they are considering installing a horizontal circulator pump to move the surface algal scum to this pond’s outlet.
I would welcome hearing from anyone who might have experience or insight into either of these treatments.
William W. Jones
School of Public and Environmental Affairs
1315 East Tenth Street
Bloomington, IN 47405
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