Periodic Products has developed a filtration system for irrigation well water that rapidly removes iron and other metals. Homeowners and commercial establishments expend substantial resources irrigating lawns and plants with municipal drinking water, removing stains from stucco, vinyl, plastic, fiberglass, and cement surfaces, and repainting stained surfaces caused primarily by high levels of iron in the water. The filtration unit attaches to existing irrigation systems and operates without electricity. Easy to replace metal-binding filter cartridges provide an economical solution to this costly and annoying nuisance.