Hi my daughter has a kidney condition and only has 15% of her left kidney functioning, I believe that water/urine still passes through the kidney but the kidney doesn't do its job of removing the wastes from it there for the need of diayasis there for not regulating the electrolyte balance and bllod pressure and stimulating the production of red blood cells. So the water still passes through the kidneys but it isn't filteredetc but is still there for urination.
that depend on fact of kidney filtrating capacity Vs urine as merit liquid...
filter can pass water but the question does it filter water?