I noticed that my orchids have salt buildup on the leaves and on the mounts and pots. My municipal water company thinks my TDS (total dissolved solids) in my water is about 300 ppm. I'm looking for an economical way to do some filtration. Does anyone know if those hose attached water filters used in RVs are effective in lowering TDS? Is there a preferred method to lower salt in the water (reverse osmosis?)?