How much it makes depends on the feed water supply pressure, temperature, and quality. The system includes an electronic faucet assembly with an integrated water testing feature. When water is taken from the faucet, a green indicator light means TDS removal is within the specified limits, and that water quality is good.
The prefilter and postfilter are replaceable cartridges. The carbon prefilter removes chlorine while also filtering sediments. The postfilter removes any other undesirable tastes and odors before you use the water.