Outdoor Water Solutions PSP0134 Lake and Pond Water Clarifier by Outdoor Water Solutions. $58.52. Easy to use dry product, no liquids to spill. All natural solution to help keep your pond clean and healthy. PSP0134. Helps clean up murky water and improves water clarity. A non-toxic granular product commonly used in the water treatment industry to improve water clarity. It also reduces the amount of phosphorous in the water and helps clean up murky pond water. Made in U.S.A.