The situation changes when the drain is several meters away.
A long flexible hose may still seem like the easiest solution, but in practice it can become difficult to route properly, easier to kink, harder to secure and less convenient to service. For this reason, longer drain runs should be planned more carefully.
Short Runs and Long Runs Are Not the Same
For short distances, a flexible drain hose is practical and easy to install.
When the wastewater connection is much farther away, the installation becomes more demanding. The longer the route, the more important it is to keep the drain line stable, protected and free from unnecessary bends or restrictions.
This is especially important during regeneration or backwash, when water must be discharged reliably from the control valve to the wastewater system.
Why a More Rigid Drain Section Can Be Useful
For longer drain routes, I often prefer to use a more rigid section for the main part of the installation instead of running a long flexible hose all the way to the drain.
The exact solution depends on:
the distance to the wastewater connection,
the available installation space,
the route of the drain line,
the number of direction changes,
and the type of water treatment system.
A more rigid drain section can make the installation easier to support and organize. It can also reduce the risk of accidental kinking or movement of the drain line.
Flexible Sections Still Have Their Place
A rigid section does not mean that flexible hose is unnecessary.
Short flexible sections can still be very useful near the treatment unit and near the wastewater connection. They make final connections easier and allow some freedom during servicing or maintenance.
The key is to use each type of connection where it works best.
Drain Routing Matters
A drain line should not be treated as an unimportant accessory.
Poor routing can create unnecessary resistance, increase the risk of kinking or make future servicing difficult. A well-planned drain connection should be simple, secure and easy to inspect.
This is especially important in installations where the drain route is long or where the wastewater connection is located in another room, utility area or technical space.
Think About Service Access From the Beginning
A good installation should not only work correctly after commissioning.
It should also be easy to service later.
Connections should remain accessible, flexible sections should be easy to replace, and the drain line should not be hidden in a way that makes inspection difficult.
A few extra minutes spent planning the drain route can save much more time during future service visits.
Practical Experience Matters
There is no single drain arrangement that fits every installation.
The best solution depends on the building, the distance, the available space and the equipment being installed.
That is why practical installation experience is so important. Small details in the drain system can have a major impact on reliability and future servicing.
In my upcoming technical guide for water filter installers and service technicians, I describe these types of installation solutions in greater detail, including the fittings, connection methods and practical layouts used in real installations.
Read more about the upcoming book:
https://filtersystem.blogspot.com/2026/05/new-book-in-progress-installation-and.html
