You can get an inline filter that you can install externally or internally. They are pretty cheap, have replacable filter cartridges and don't have a really serious impact on water pressure if all you want to do is filter out sediment. Here is an example.
http://www.waterfilters.net/PDF/Filt...e_Housings.pdf
If you go to the Camping world site you will find a large variety of filters. Just remember that the filtration size has a inverse relationship to water pressure on the outlet side. A sediment filter has the least impact on water pressure, a activated charcoal filter more and the bio-filters which often use ceramic filters significantly reduce water pressure and really are meant for drinking water taps not a whole house system.