Upgrading to this premium see-through Clear Housing on the first filter offers many advantages. Without opening the housing, you can easily monitor the filter's condition. You'll get an idea about your water's quality by looking at the color and speed of build ups on the filter.

Although the RO's 3 pre-filters normally last 12 months on most city water sources, they may need replacing sooner if your water source has heavy sediments and other contaminants.

So how do you know when to replace the pre-filters?

Just look at the stage-1 prefilter -- when it turns from pure white to dark brown or even black, then you know it's time to replace the pre-filters.

	Allows you to see when
	THIS	becomes	THIS!
		=

APEC Reverse Osmosis Water Filter Systems