Clarify wash plant effluent water while thickening slurry to reduce the volume of slurry going to the pond. AltaFlo™ HighRate Thickeners. Thicken, clarify, mix, flocculate, and remove sludge all in a single tank. Sand Washing Modules. Wash, classify, dewater, and recover sand and fines with controlled particle size distribution. Water Recycling Systems. Collect, recycle, and reuse .