Washing clothes with the water would be a great use of the waste water. especially if you then use the gray water to water your yard afterwards. For the amount of "crap" in the water, My TDS readings are 225 on my tap water, if you double that to 450 that is still acceptable drinking water in fact TDS must be at 1000mg/L before the EPA considers it unfit for human consumption. Just something to think about.
TDS (Total Dissolved Solids): Total dissolved solids (TDS) comprise inorganic (principally
calcium, magnesium, potassium, sodium, bicarbonates, chlorides and sulfates) and organic
matter that is dissolved in water. TDS in drinking-water originate from natural sources,
sewage, urban run-off, industrial wastewater, chemicals used in the water treatment process,
and the nature of the piping or hardware used to convey the water, i.e., the plumbing. An
elevated total dissolved solids (TDS) concentration is not necessarily a health hazard. The
TDS concentration is a secondary EPA drinking water standard and therefore is regulated
because it is more of an aesthetic rather than a health hazard. Acceptable result: < 500 mg/L
(A reading above 1000 mg/L is considered by the EPA to be unfit for human consumption).