The invention relates to a heat recovery unit to transfer heat from a gray water source discharged from a bath or a shower to preheat fresh cold water supplying a bath, a shower, a boiler system or hot water heater. The heat recovery unit comprises an inner tube, an outer tube, a non-return valve, an anode, as well as associated piping and fittings. Fresh water from a pressurized public network or well flows through the inner tube while the gray water flows between the inner and outer tubes. The non-return valve installed in the fresh water pipe prevents contamination of the drinking water system. A translucent pipe may be installed in a section of the gray water piping system to detect any leaks. An insulated jacket may be placed around the unit to reduce heat loss. The heat recovery unit may be used in domestic, commercial, industrial and institutional buildings.

According to embodiments of the present disclosure is a water delivery system that continuously flows and recirculates clean water, diverting only water that has touched a user's hands. No sensing is required to activate the water flow and the actions of the user effectively divert the dirty water to a drain. The water delivery system comprises a clean water outlet, a clean water inlet, a dirty water drain, and a circulation pump. A stream of water continuously flows from the outlet and is received by the water inlet if the stream is uninterrupted. If the stream is disturbed, such as by the hand washing activities of the user, the stream is diverted from the inlet and instead falls into a sink and into the drain.

A grey water recycling assembly for recycling grey water from a sink for filling a tank on a toilet includes a hose that is fluidly coupled to a drain of a sink for capturing grey water from the sink. The hose is fluidly coupled to a tank of a toilet. Additionally, the hose is oriented to angle downwardly between the drain and the tank to gravity feed the grey water into the tank. In this way the hose directs the grey water into the tank of the toilet for filling the tank of the toilet with recycled water. The hose is comprised of a flexible material thereby facilitating the hose to be routed in a preferred route between the drain of the sink and the tank of the toilet.

The invention relates to a heat recovery unit to transfer heat from a gray water source discharged from a bath or a shower to preheat fresh cold water supplying a bath, a shower, a boiler system or hot water heater. The heat recovery unit comprises an inner tube, an outer tube, a non-return valve, an anode, as well as associated piping and fittings. Fresh water from a pressurized public network or well flows through the inner tube while the gray water flows between the inner and outer tubes. The non-return valve installed in the fresh water pipe prevents contamination of the drinking water system. A translucent pipe may be installed in a section of the gray water piping system to detect any leaks. An insulated jacket may be placed around the unit to reduce heat loss. The heat recovery unit may be used in domestic, commercial, industrial and institutional buildings.

The present invention describes a hybrid device (1) for a recirculation shower, allowing purification and either recycling of water or discarding of water, wherein said hybrid device (1) comprises a recirculation loop (2), a filter system (4) with a nano-filter (5) such as for instance an electropositive nano-ceramic filter, e.g. a nano alumina (fiber) filter, at least one filter quality sensor (3), at least one pre-filter (6), and wherein the hybrid device (1) is arranged to redirect the water from recirculation to drainage when the at least one filter quality sensor (3) indicates the need thereof.

This specification describes an intake filter for use, for example, in a system that collects greywater from baths or showers for re-use in toilet flushing. The intake filter provides essentially dead-end filtration. An influent by-pass may be provided, but the filter is cleaned as required to reduce use of the by-pass. Cleaning is performed when permeability of the filter declines. An upstream sensor may be used to detect the permeability of the filter. In one cleaning method, flowing water, optionally with air, is used to backwash the filter. The impulse of the flowing water also moves one or more valves to direct backwash water to a sanitary drain. For example, pumped effluent may impinge against a first flap to close an effluent drain, the first flap being mechanically linked to open a flap covering the sanitary drain.

The present inventive concept relates to a water recycling device comprising: an outlet configured to output treated water; a drain for collecting used water output from said outlet; a return/evacuation path in liquid communication with said drain, wherein said return/evacuation path comprises an inlet for receiving water collected by said drain; a return path in liquid communication with said return/evacuation path; a treatment path in liquid communication with said return path and said outlet; an external water path in liquid communication with said treatment path, said external water path being connected to an external water outlet; a valve arrangement configured to accept as inputs used water from said return path and/or external water from said external water path, said valve arrangement being placed between said return path and said treatment path, said valve arrangement being configured to direct said inputs to said treatment path, said valve arrangement being configured to mix said external water with said used water from said return path; a circulation pump for providing a flow in said water recycling device; and a water treatment arrangement placed downstream to said valve arrangement.

The present inventive concept relates to a method for recycling water in a water recycling device, the method comprising: receiving used water via a drain; determining a water quality measure of the used water; if the water; quality measure of the water is above a first quality threshold, feeding the used water to a valve arrangement; in the valve arrangement, forming water to be treated by providing external water, the used water or a combination of the external water and the used water; generating treated water by treating the water to be treated using a water treatment arrangement; and feeding the treated water to an outlet. The present inventive concept also relates to a water recycling device.

The present invention describes a hybrid device (1) for a recirculation shower, allowing purification and either recycling of water or discarding of water, wherein said hybrid device (1) comprises a recirculation loop (2), a filter system (4) with a nano-filter (5) such as for instance an electropositive nano-ceramic filter, e.g. a nano alumina (fiber) filter, at least one filter quality sensor (3), at least one pre-filter (6), and wherein the hybrid device (1) is arranged to redirect the water from recirculation to drainage when the at least one filter quality sensor (3) indicates the need thereof.

The current invention provides an excess water slot to be installed in the ordinary slot opening of hand wash basins and in kitchen basins. The slot is provided with a flexible pipe exiting from the middle of the wash basin: The pipe has a suitable height (approximately ?/+15 cm high) according to the basin size. The pipe is bendable and foldable to receive unused water flowing from the faucet and leaking's in order to separate water to be ready for recycling before it reaches the middle of the basin and mixes with turbid water: the proposed figure is the (FIG. 1) attached with the drawings below.