I built a house where my mobile home was and my well sat unused for 2 years. Now that we are moved in I am having sediment trouble clogging all my fixtures including toilet valve. The toilet float valve looked as though it had something that looked like algae or crumbled leaves which is not possible (just describing). Most of the trouble is fine black sand. My Rinnai 94 water heater screen has to be cleaned daily or more. I had a 5micron charcoal filter cartridge which did not stop this stuff. I have a yarn wrapped style cartridge in fliter housing now and it is black after a day. Should I do a spindown filter of some sort. This is a pic in the bath tub after use. Thanks all.