Filtration cartridges in polypropylene, polyamide, nylon, teflon, activated charcoal, stainless steel etc. Intended for deep suspended solids filtration, effluent refining, pathogen control, water treatment in hatcheries, nurseries, prefiltration, selective removal of chemicals etc. Plain, grooved, pleated, with different terminations, with or without core, suitable for use in aquaculture and water and fluid treatment. Designed with