Q: Do Phresh® Filters come with a
A: Yes, they include a high-quality, custom fit
Q: How long will my filter last?
A: Under typical conditions, with a clean
pre-filter and correct CFM, a Phresh® Filter will last
approximately 2 years. Use our Phresh® Filter calculator to
determine the right filter for you.
Q: Will temperature extremes and high humidity
reduce the life expectancy of my Phresh® Filter?
A: Yes - temperatures over 95° F and humidity
over 75% will reduce the filter life.
Q: How can this filter handle more air flow,
and last longer than other filters yet be so light?
A: The carbon we use is Australian RC-48 carbon
derived from coal. It is widely known as the best carbon for air
filtration. This carbon is far superior to carbon derived from coco
in its ability to collect particulates and odors. Due to the
density and increased surface of the RC-48 particulate carbon we
can use less carbon in the filters. Pelletized coco carbon cannot
match the performance of our carbon so competitors increase the
amount of carbon and wall thickness in their filters to compensate.
This makes them much heavier.
Q: Can I put a higher CFM fan than what the
A: Not recommended, the max CFM is rated on the
filters. If you go over this amount it will not give the passing
air enough "contact time" with the carbon and the filter will not
be able to do its job as effectively. Further, it will diminish the
life of your filter.
Q: How much CFM loss is there when using a
Phresh Duct Silencer?
A: Approximately 1-3% depending on size.
Q: Can I refill my filter?
A: Yes, but not recommended. After-market carbon
will most likely not be RC-48 carbon. Your filter will not be as
effective with a locally purchased replacement carbon. Also, you
will not have access to the complicated, heavy-duty machines used
to compress the carbon inside the filter. It will simply not work
like a new Phresh® Filter would.
Q: Why choose a Phresh® Filter over other
A: Simply put, this filter is half the weight,
will last twice as long and is more effective than other
Q: Do they come with a pre-filter and do I
need to use it?
A: Yes, one is included with each new filter.
Yes, you need to use the pre-filter. If you do not use it, the life
of your filter will be significantly reduced.
Q: Do I need to clean my pre-filter?
A: Yes - it is recommended that they be cleaned
or replaced every 6 months. They are machine washable. Replacement
pre-filters should be available from the retailer where you
purchased your Phresh® Filter.
Q: Is it better to hang my filter horizontally
or place it on the ground?
A: Both will work fine. Do what is best based on
the layout of your room. Set it up with the least possible
restriction (i.e. fewest bends in ducting & shortest distance
Q: Do I push or pull air through the
A: You can do either. Please consult your local
indoor gardening retailer for guidance depending on your
Q: What happens if I use a filter larger than
what your Phresh® Filter calculator recommends?
A: Nothing other than it will last longer.
Q: How do I dispose of the filter when its
life is up?
A: Use the carbon in your outdoor garden soil.
Take the steel and aluminum to a recycling center or metal scrap
Q: What type of fan should I use with my
A: You can use any high-quality inline
(centrifugal) fan that has CFM's matching the filter. Eco-Plus,
Vortex, Can and Elicent are all excellent fans.
Q: Do you have a quick reference guide to
choosing the right sized filter?
A: Yes - see below: