Following are the reliable ...

Following are the reliable suppliers of cartridge filters for SWRO Desalination Plants.

https://www.pureaqua.com/

https://www.flowserve.com/sites/default/files/literature/marketing/multibr000155-ena4.pdf

https://www.water-technology.net/projects/tuas-seawater-desalination/

https://www.waterworld.com/international/potable-water/article/16200491/swro-desalination-plant-supplies-highquality-water-in-trinidad

The first can be heavy sand filtration, followed by tight Ultrafiltration.  I would avoid actual cartridge filtration and any other form of Microfiltration.   Ceramic cross flow filters (wrongfully called membranes) in particular are notorious for leakage that cause frequent washing requirements of the RO modules.

Deep SWRO.Z filters provide effective protection of water reverse osmosis membranes sea, for greater efficiency of the membranes and a long service life