Cistern-style toilets are common in public restrooms and are usually designed for domestic use. The initial investment may seem low, however they are often made of plastic parts that cannot withstand intensive use.

The cistern flush mechanism relies on water stored in the tank to clean the toilet. However, anyone who has ever lifted a cistern lid will know that scale and biofilm (a film on the inside of pipes) can build up over time, affecting seals and causing often undetected leaks. Maintaining a large number of toilets is expensive and time-consuming, even when leaks are detected quickly. Mechanics can be difficult to access, and parts wear out quickly with frequent use, requiring more regular servicing. A direct flush mechanism connects directly to the water supply and uses system pressure to flush the toilet; no reservoir is required. The flush mechanism has an integrated stopcock so that the filter element can be removed, serviced and/or replaced without shutting off the water supply. Since these mechanisms are designed for intensive use, they have a relatively long lifespan. Although they are more expensive, they are more cost-effective due to their low maintenance and long lifespan.

The direct flush technology eliminates any standing water, and the electronic flush mechanism provides a duty flush to prevent bacterial build-up. Some electronic direct flush valves have an intelligent flush system that recognizes the duration of use and flushes accordingly. They are also available in an eco setting, reducing the length of the flush, which equates to less flush volume, to prevent waste. The direct flush valve is vandal resistant to prevent abuse. In addition to the wear-resistant mechanism, some have an anti-blocking mechanism that flushes once the button is released. Flush systems offer a sustainable alternative to cistern toilets. They will pay long-term dividends in terms of sustainability, improved hygiene and low maintenance.