Hassle & BPA free filters. Note there are 3 filters behind the water tank. They may not wear off at the same rate, so you may need to change them separately; but if you don't want to think about them, you can just change them all at once, even though it will slightly be wasteful.

INSTRUCTIONS:

Twist off the filters clockwise to take them out, throw the old filters to recycling, load the new filters in by twisting counter-clockwise. Do them one-by-one. Make sure the notches on the adapter and the filter match and filters are on the right order (1 PAC, 2 RO, 3 GAC). Easy peasy.