Based on :

https://mrrecifcaptif.fr/la-decante-pour-aquarium-recifal/

Summary

This discussion is a complete guide on sump for reef aquariums. It begins by explaining the advantages and disadvantages of sump, then it explains in detail its operation, its installation and its different possible configurations. The guide then explores the calculation of sump volume, the manufacture of sump and the design of custom sump. Finally, it covers the equipment to install in the sump, the maintenance and cleaning of the sump, the potential problems and the solutions to solve them.