Here are the replacement filters and parts for your W10 system:
American Plumber W10-PR Heavy Duty Whole House Water Filter Housing 152014
If you have well water, you will want to go with the DGD-5005 filter over the ECP5-BB filter. The ECP series are not designed for well water. Both the DGD-5005 and the ECP5-BB are 5 micron sediment filters. The GAC-BB is a carbon taste and odor filter.
It's a good idea to replace your OR-100 oring every couple of times you replace your filters. You will need to lubricate the o-ring with silicone grease every time you replace the filter.
Thank you,
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