Page 201 - Water_Controls_for_Public-Commercial

Solutions for cistern-less WC flush systems /

ADVANTAGES OF DIRECT FLUSH DISADVANTAGES OF CISTERNS

Water savings Leaks and overconsumption of water
• Thanks to the direct connection onto the pipework without • Plastic mechanisms inside the tank are constantly submerged
any intermediary, there is no need for a fragile mechanism. and, therefore, sensitive to scale build-up.
• The risk of leaks is greatly reduced with this system. • They are the cause of frequent water leaks which are often
• On electronic versions, an intelligent flush programme invisible and inaudible and therefore detected late.
determines the optimal flush volume for perfect cleaning • Cisterns are the main source of wasted water. For example,
and reduced water consumption. a small leak from a cistern can cause a loss of 220m³ of water
that equates to €946 per year.

Hygiene Hygiene problems
• The flush connects directly to the water system. • Cistern: up to 9L of stagnant water at an ambient temperature
• No cistern: no water stagnation or bacterial development. which encourages bacterial development.
• Flushes automatically, without manual contact. • Bacteria can spread throughout the hydraulic installation.
• Pipework flushes daily to prevent bacterial proliferation • Bacteria can be projected through the air via the flush plume
in the water system. and inhaled by the user.

Immediate availability Waiting time
• Possible to use for successive flushes without having to wait • The cistern has to refill between each use, which may
between 2 uses. take up to 1 minute.
• An essential feature for periods of high traffic (e.g. motorway • In the event of a leak (even minimal), the tank may fail to
service stations, stadiums, concert venues, schools). fill and cause inconvenience and lead to vandalism by users.
• Successive flushes are not possible.

Limited and simplified maintenance Frequent maintenance and difficult to access
• Specifically designed for frequent use, direct flush • Not designed for intensive use, the cistern's fragile mechanism
mechanisms are durable (up to 500,000 operations) is not very durable and must be changed regularly.
and resistant (scale-resistant mechanisms). • Dismantling and access to the mechanism is difficult,
• Maintenance is, therefore, infrequent and the mechanism and the bottom of the cistern remains inaccessible.
is easy to access from the front when necessary. • Control plates need to be replaced frequently to compensate CISTERN-LESS WCs
• 30-year warranty. for careless use in public places.

Powerful and effective flush Ineffective flush
• Uses the pressure in the pipework to rinse the pan. • The water drop between the cistern and the WC pan is only
• Thanks to the powerful flush, cleaning is effective and guarantees a few centimetres.
a clean WC pan. • The flush force is not powerful enough for effective cleaning.

Space saving Large footprint
• With no cistern, the frame systems with direct flush valves are • Frame systems with cisterns take up more space and use more
more compact and can save several m² in a building. floor space.
• This space saving can optimise the profitability of a project when
the price per m² is high.

Cistern-less WCs 199