Boann Reverse Osmosis 5-Stage Water Filtration System, User Manual, Page: 19 / 24

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Recommended Filter Replacement Schedule
Pre and Post Filters: Defined as the filter stages Pre (before the R.O. Membrane) and Post (after
the R.O. Membrane).
Stage 1, 2 & 3 Pre-Filters - When to Conduct a Filter Change.
Stages 1, 2 & 3 are the filtration system’s pre-filters which need to be changed approximately
every 1,000 gallons or every 6-months. On average households consume about 5 gallons of
drinking and cooking water daily and, as such, a filter change is required every 6 months or
sooner. For your convenience, a monthly maintenance schedule checklist is provided on the
label of each filter to keep record of routine filter maintenance. As an added measure, mark your
calender for a routine filter change every 6 months.
WARNING! If the pre-filters are not changed before 1,000 gallons of purified water is produced,
chlorine will bypass the pre-filters, thus entering and damaging the R.O. Membrane, rendering it
useless and in need of premature replacement.
Stage 4 - Reverse Osmosis Membrane Replacement
The R.O. Membrane is the most important component of the Boann Reverse Osmosis 5-Stage
Water Filtration System. The R.O. Membrane is rated for 4,000-5,000 Gallons of purified water
production. A new R.O. Membrane will last approximately 3-4 years. However, it is suggested
replacing the R.O. Membrane every 2 years for system and performance optimization.
• A standard household will consume between 3-5 gallons of purified water each day for
drinking and cooking. A 3-gallon per day consumption rate over a year’s time is equal to
roughly 1095 gallons, which therefore requires the Reverse Osmosis Membrane to be
changed about every 3.5 years.
• A 5-gallons per day consumption rate over a year is equal to approximately 1825
gallons which in turn requires the Reverse Osmosis Membrane to be changed
about every 2-2.8 years.
When in Doubt, Replace the R.O. Membrane
Boann recommends to replace the R.O. Membrane if it has never been replaced and if the
R.O. filtration system is more than 3 years old. If the age of the R.O. Membrane is unknown, it is
recommended to replace the filter as soon as possible.
Stage 5 - Post Carbon Filter Replacement
The Post Carbon Filter is the last filtration stage in the Boann Reverse Osmosis 5-Stage Water
Filtration System. The Post Carbon Filter is rated for 1800-2000 gallons of purified water
production and should be changed once a year or every second time you change the three
pre-filters.
Water Filtration Filter Schedule