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Recirculating Aquaculture Systems (RAS); closed-loop systems for filtering and cleaning of water; Bio reactors for water treatment, Moving Bed Biofilm Reactors (MBBR), Membrane Bio Reactors (MBR), Anaerobic Membrane Bio Reactors (AnMBR), Fixed Bed Biofilm Reactors (FBBR), and Fixed Film Reactors (FFR); Biofilm carriers and biofilter media for use in bioreactors for water treatment; biological filters for water treatment including moving bed biofilters, fixed-film biofilters, and fluidized bed filters; mechanical filters for water treatment including drum filters, sand filters, or sieve filters; Components of plastic (not un- nor semi-processed plastic) for chemical filtration for water treatment; biofilm carriers and biofilter media for nitrification and denitrification in fixed filters and moving bed filters; water purification installations; water filtering apparatus; water sterilizers; water purifying apparatus and machines; water supply installations; plastic elements for water purification