Does using less water with the Propelair toilet cause blockages?

We occasionally get asked if using so much less water with the Propelair toilet is going to cause blockages.
The short answer is no.

As part of our Horizon 2020 project, we worked together with a major UK university to trial the Propelair toilet in-situ. The trial covered 7 buildings, 38 washrooms and 119 toilets, which were installed as retrofits. The trial took place before the pandemic and as such, is based on high footfall and frequent use by both staff and students at the seven buildings.

The facilities, estates and maintenance teams were initially concerned about blockages or other maintenance issues that they thought could happen as a result of flushing with less water.

In the course of the trial, we were able to determine that the Propelair technology was not associated with increases in drainage infrastructure issues, such as blockages and sewer deposits.

Blockages did occur – but after thorough investigation of the blocked locations, it was found that the risk of blockage in the sewer network had not increased as a result of the Propelair installation programme.

Instead, the issues in the downstream sewer network were attributed to local pipe failures such as cracked joints, flat laid pipes, root ingress.

Through discussions with the university’s maintenance team, it became clear that most issues had been known problems prior to the Propelair install, and that they were being managed by their team prior to and throughout the trial period.

Recommendations were made to undertake upgrades (sewer pipe repairs). No other issues have been reported since then.

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