Has anyone DIY a RO/DI system?

[Islandvib3s]

I'm thinking about making one myself as a upgrade from my 75gpd RO/DI buddy. (2) 3 10in canister housings,tds meter 3 points, sediment, carbon blocks,di. Just looking up prices and it looks way more cheaper then the pre builds. I might need a booster also but not sure,just in planning stage as its almost time to replace my cartridges on the ro buddy. And tips,advice,tricks is appreciated. Happy reefing here's my 75 build I start this yr.

 

[HuduVudu]

Mounting is the most difficult part.

Yes, DIY is much cheaper.

 

[Kazumi]

I sort of have. In the past I took 4 housings and plumbed them together. I didn't have a RO membrane but that would have been easy to add. Currently, I took two 4 stage RO's and made a 7 stage dual membrane unit out of them with 5 TDS meters on it.

 

[AJsReef]

I've taken canisters and put them in series to add additional filtration. Getting the mounts and fittings generally brings the cost pretty close to buying premade.