when we first stop water is dirty, tried emptying and also milton tablets,but still same we are in coaster. Water clears after awhilei look forward. To your advice

Try flushing water in heater to see if that is where it is hiding.

We use a 5um sediment filter followed by a 1um carbon/silver filter for drinking water and a 25um sediment filter for washing water.
Always get clean water.
(We also chlorinate all our water to kill any bugs).

Cheers,
Peter