The problem was simple, but the solution appeared difficult. An overabundance of freshwater clams and algae flourished in reservoir lakes at city parks in Scottsdale, Arizona. The lake water used to irrigate park plants and grasses was fouled with contaminants, which choked pipes and sprinkler heads, causing the irrigation system to fail. California-based Amiad Filtration Systems was able to provide the answer. The company installed its compact automatic self-cleaning filters at four locations to remove clams, their larvae and algae. After a year of continuous operation, this problem is now considered solved.