I see. Well if that is the case then the Buddi unit should pay for its self and even save me money within a year or so. Thank you!The RO Buddie is a good system and you can get the replacement sediment and carbon cartridge on amazon ($7.99 and $9.99) Also the membrane replacement around $16.00 - $40.00 range. Even you can buy a bundle of all three for $45.00.
How long they will last depends of your tap water quality. In my case I replace the sediment and carbon around 6 to 8 months, and the membrane around 2 years.
Also you can add an DI resin cartridge for $18 and then just buy DI resin in bag and replace the one in the cartridge when is exhausted.
Im using this system for 100 gallons tank at it works fine.