I got a used Kent RO/DI No flush on it yet, but I am getting readings of 10 out with 700+ppm in

I've got a 5 stage SpectraPure MaxCap 180gpd. It removes chloramine, but not by using a "catalytic" carbon filter. It's removed on mine by way of the "SilicaBuster" cartridge. There's two types available. Regular "SilicaBuster" and one that also removes chloramine. It's the 5th stage. The carbon filter is a regular Johnny Average carbon filter. I love my unit. Right now, with the colder water coming in due to the season, I'm getting about 4.1 gallons/hour. But in warmer months and with new a sediment filter and carbon block, I've had as high as 5.3 gallons/hour.

HTH and cheers,