A lot of great info KB - higher cooling tower pH circa 8.5 eliminates chlorine as a successful algae treatment.
We have had a lot of success using BCMDH tablets - these bromochloro hydantoin tablets dissolve slowly and offer good stability at higher pH. It can be fed in to the system as simply...
Sounds alot like a build up of sediment/scale clogging the intake holes feeding the spray nozzles in distribution box.
A build up of this kind will usually simply cause towers to overflow but if the panels were secured tightly to box at that flow rate the plastic deformation of the panels is...