Abstract: The invention related to liquid supply systems of buildings and constructions, where intake water line is connected to outer municipal, city, or local water supply. Also, liquid supply systems with two liquid sources, where intake liquid line is connected to outer water supply and simultaneously to the alternative water source, for example vessel filled with rainwater are known from the state of the art. Such systems can be used for cold as well as for hot water. The water supply system includes a liquid intake line, connected with at least two sources of water—an outer water supply line and an alternative source, made as a collecting vessel, and a liquid supply line, characterized in predominant water supply from the alternative source as the tank on the alternative source water supply line has the pressure higher than the pressure of the outer source.

Abstract: The invention relates to liquid purification systems with filtration membranes application, intended for liquid purification and desalination, predominantly water from different recourses, including drinking water, process medium, drainage, drinks and other liquids in household or technical conditions, in country and suburban and garden plots. Liquid purification system comprising raw liquid supply line, liquid purification unit, connected to raw liquid supply line, purified liquid line, connected to purified liquid outlet of the liquid purification unit, and drainage liquid line, connected to drainage liquid outlet of the liquid purification unit, besides liquid purification unit comprises at least two membranes in a shells and connected to each other through two collectors, characterized in that collector is formed by at least two elements, communicating between each other through the adapter plugs and connected between each other with fastener.

Abstract: The invention relates to liquid purification and/or desalination systems, predominantly water from different sources, and is used in household and/or drinking water supply, in suburb and country houses. Liquid purification system, comprising of raw liquid line with the inlet valve, reverse osmosis membrane connected to drainage line and purified liquid line and purified liquid consumption line and purified liquid vessel, secondary purified liquid line, connected to purified liquid vessel and to raw liquid line and to console panel, characterized in that debris layer on the reverse osmosis membrane is near totally dissolved by intensive repeated flushing of the reverse osmosis membrane with purified liquid.

Abstract: The invention relates to liquid predominantly water purification systems of membrane type and/or of desalination type with recirculation used in industry household and/or drinking water supply on factories, water treatment stations, public institutions, household, in country side. Liquid purification system with predetermined ratio between purified and drainage liquid, containing raw liquid line equipped with pump, membrane element, connected to purified liquid line and recircualtion line, equipped with pressure regulator, and connected to drainage liquid line, characterized in that it is configured to spontaneous pressure maintenance not less than necessary to carry out the filtration process, because pressure regulator is made as mechanical spring valve, and the ratio between raw liquid feed velocity and total velocity of purified liquid and drainage liquid withdrawal more than 1. 1 independent and 2 dependent claims, 1 figure.