====Maintenance====
====There are no moving or mechanical parts to break. The piping is embedded in concrete, protecting it against breaks and leaks. Cracks can sometimes be repaired. Concrete filters are heavy (70 – 75 kg for thin wall version and 135 kg for heavy wall version). Poor transportation of filters can lead to cracking and/or breakage. Filters should not be moved after installation. Maintenance====is required when the flow rate drops to a level that is inadequate for the household use. Swirl and dump maintenance for the top layer of sand is simple, takes a few minutes and can be done by household users. The frequency of swirl and dump depends on turbidity of inlet water. The outlet, lid and diffuser should be cleaned on a regular basis.
====Manufacturing====
Working with cement and heavy molds is potentially hazardous and adequate safety precautions should be used. Concrete filters are heavy and difficult to move and transport.
There are no moving or mechanical parts to break. The piping is embedded in concrete, protecting it against breaks and leaks. Cracks can sometimes be repaired.
Concrete filters are heavy (70 – 75 kg for thin wall version and 135 kg for heavy wall version). Poor transportation of filters can lead to cracking and/or breakage. Filters should not be moved after installation.
====Estimated Lifespan====