The Whale AquaSmart carbon water filter is designed for caravans and motorhomes with an onboard water pump. Simply attach to your filter plug assembly and allow it to drop to the bottom of the water container.We recommended that you change your AquaSmart water filter every 3000 litres (or approx. 30 days) to prevent debris in the filter impacting the pump's performance.Silverized carbon filterFilters fresh water supply - removing unpleasant tastes and impuritiesFilters up 3,000 litres of waterEasy to install - simply screw on/off