guardian filtration products, max clear ion exchange pre-filter, garden hose filter, removes metal, minerals, calcium, fill pools & spas guardian filtration products connect to any standard garden hose for many uses - filling pools, spas, hot tubs, and ponds, outdoor pet baths, spot-free car washes, watering gardens & more. pre-filtering is the easiest way to balance your chemicals from the start, reducing usage & saving you money! great for top-offs or entire fills- a must for those with well water! ion exchange technology to soften, purify & decontaminate* removes common hard water minerals including calcium, magnesium, iron, lead & copper as well as lime scale, chemical contaminants, algae, organic debris toc's, voc's, chlorine by-products & suspended solids filters up to 8,000 gallons, removing up to 99% of contaminants & hard mineral deposits 3/4" hose fitting at top, 1/2'' threaded male connection at bottom