murky white water from new iSpring PH100 under sink RO unit?

New RO 6 stage unit, flushed tank 5 times now and after 5 minutes of not drawing water it will come out murky white.

it may be hard to tell from the one photo, but after letting the faucet run for 5 seconds the next cup is much clearer. After flushing the tank once, the water was wayyy murkier than this so it does seem to be getting better…

what is this, and is there a way to stop this from happening?