Clayish Silt and Iron Filtration

I am on a well that supplies water along with an amount of clayish silt and iron.
I bought a Big Blue 20″ dual filter system some time ago and have been using a S1-20BB 20 micron pleated cellulose in the first position and a CP5-20BB 5 micron pleated cellulose-polyester in the second position.
This does a pretty good job on filtering the silt but after about 4 weeks of use I start getting a rotten egg smell from the faucets and I have to drop the filters and add bleach to the system.
This goes on every 3 to 4 weeks.

This last time I decided to try a DGD-2501-20 Dual Gradient Polypropylene 25/1 micron in the first position and a RFC-20-BBS Radial Flow Carbon in the second position.
My thinking was that the dual gradient would do the filtering and the carbon would help with the “rotten egg smell”…
But after only 3 weeks I notice a drop in water pressure and I thought that the Polypropylene filter must have clogged already.
Upon removing it I noticed that the top sealing surface was way off to one side and it looked like silt was getting by.
So I removed the carbon filter and discovered that this expensive filter was clogged with silt.
Evidently the spun filter was too narrow to be centered by the guide in the top of the BB housing and didn’t seal properly!
So, I guess I can rule out this combination again.

My question is, what combination of filters should I use that will filter down to at least 5 micron, but also reduce the amount of bacteria that is causing the “rotten egg smell”?


We can’t provide local service, and it would be impractical to give advice on a situation like this in a long-distance matter. A local water technician might be a good approach.
However, since some details are already described, the S1 + CP5 did a good sediment removal job, and we understand that the RFC would do the iron removal, so setting up as a 3 unit system would be the first suggestion.

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