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.