Clivus Multrum™ Installation Overview

Clivus Multrum™ installs are straightforward when the site is prepared correctly and the foundations, chute, vent, and leachate pathway are set in the right order. Below is a quick overview of what is involved—detailed installation instructions are provided with every system.

Batching system

Start by checking you’ve got the right ground clearance under the floor. Put in a stable, level foundation for the chambers to sit on—compacted gravel, a small concrete pad, or level pavers all work well.

Before you position the chamber, set up the drain for excess liquid exactly as per the instructions; if you’re digging a trench or a bore, you’ll need the appropriate digging tools.

Once the foundation and drain are sorted, set the chamber on the base, line it up under the pedestal location, and cut the chute to the correct length. Fasten and silicone the chute in place, then set the pedestal over the top.

Fit the vent stack and fan so the system draws continuously from the toilet room to above the roof.

If you’re installing a zero-leachate system, connect the chamber to the in-ground sealed tank and secure the recirculation feed up to the chamber.

Continuous system

Decide early whether the chamber will be partially buried or set entirely above ground. If burying, identify the required depth from the manual; if not burying, you need a stable, level foundation to keep the tank steady—compacted gravel, a concrete pad, or pavers work well. Even for buried installs, a stable base is preferable. 

Understand your water table: where risk of high water table and flooding exists, add anchors on larger buried units so the tank can’t move, settle, or throw the chute out of alignment between the toilet and chamber. You can dig the hole and prepare the base by hand, or use machinery for convenience; if you’re working under or near a structure, use a spotter.

Set up the drain for excess liquid as per the instructions. If you’re digging a trench or a bore, make sure you have the right tools.

Once the hole and foundation are prepped, slide the chamber into place. With the tank established, set the chute length and cut the opening in the tank top. Install the boot, push the chute fully into place, then fasten and silicone the pedestal in place.

Fit the vent stack and fan so the system draws continuously from the toilet room to above the roof.

If you’re installing a zero-leachate configuration, connect the chamber to the in-ground sealed tank and secure the recirculation feed up to the chamber.

Wait until all installations are complete to backfill around a partially buried tank, as the tank might have to be shuffled for better chute alignment if alignment isn't established from the beginning.

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