An important point to consider when choosing a wash unit or treatment chair with a water drainage system is whether the unit is equipped with a wastewater pump or relies solely on gravity drainage.
If the chair operates using gravity drainage only, the waste outlet must be positioned significantly lower than the chair's drain outlet to allow water to flow freely into the sewage system. Otherwise, water may not drain correctly, leading to slow drainage, standing water, or potential plumbing issues.
Models fitted with a wastewater pump offer greater installation flexibility, as they can pump water to a higher drainage point when required.