Doulton Whole House Multi Candle Ceramic Water Filter Model: Rio 2000. 6 ceramic sterasyl candles and module for microbiologically safe water for the whole household. Our filter housing is designed for complete 100% positive seal ensuring no by-passing of untreated water. Unlike most BB housing which are designed for nominal filtration (none critical application) which may or may not filter out 100% of the incoming water. More details...