A few years ago I installed a Whirlpool under sink water filtration system that I purchased from Lowes, as part of a kitchen renovation.

I've just replaced the filter again (following the manufacturers procedure (filter model# WHKF-GAC)), and once again have noticed that the water coming out looks less drinkable than the water coming from any other tap in the house. The water coming out after not using the faucet for a bit is white (not a bit cloudy, WHITE), and only slightly clears up after running the tap for a minute.
I've followed the manufacturers instructions, and flushed the system for 5 minutes after the filter replacement (what a waste of water). But the problem persists, and from previous experience will likely persist for the next week or so. Is there a way to clear up the water sooner, or do I have to continually waste water flushing the system for a minute or so before drinking?