QUOTE(Tohsan @ Aug 25 2009, 10:33 AM)
Ya the manual do mention the active carbon can be wash n re-use but I change them after 3 years usage. While the HEPA filter I change once every year.
What is the concept behind that actived carbon can be washed to re-use?
As i know odors (VOCs) captured by adsorption method into carbon surface on its mirco-pores structure. If it is that easy to remove out the odors by using water, then it should easy release back by air flowing through (desorption).
Further more VOCs / odors is not water soluble. That mean what have been adsorbed is impossible to be wash out by water. You can search around internet about this.
As i know, in industry, re-activation of carbon or we call as re-use of carbon only can be done by High-temperature treatment. And this is a very expensive treatment.
This is the similar way how activated carbon being made. Taking coal or coconut shell burn in a furnace up to 500~800 degree C to be come charcoal (no mirco-pores on surface). From charcoal, it need to burn in another furnace up to 1000~1500 degree C to be come activated carbon.
So do you think re-use of carbon is just washing it?
I have doubt on this, can any one explain or share on their experience?
So we can know more.
Thank you!
Added on August 26, 2009, 12:04 pmQUOTE(dreamer101 @ Aug 25 2009, 06:52 PM)
ozak,
There are TWO filters in Honeywell.
1) Carbon pre-filter
2) HEPA filter
(1) need to be replaced. (2) do not need to be replaced.
<<You cannot remove 100% of the dust, bacteria or smell from the filter when been using for yrs and yrs. >>
Most of the dust is trapped by pre-filter. Smell is removed by carbon pre-filer too. Bacteria is TOO SMALL to be removed by either filters.
Actually, it is VERY SIMPLE to understand this if you have a car. How often do you change your car air filter?? This is WHAT Honeywell design come from.
The motor last about 10 years. As long as the HEPA filter last that long, it is good enough.
We vacuum both our pre-filter and HEPA filter every few months. There are not much dust in HEPA filter.
Dreamer
Hi Dreamer,
Totally agree with you, "We vacuum both our pre-filter and HEPA filter every few months. There are not much dust in HEPA filter."
This can extend the life span of the HEPA filter.
But I think this will affect the filter efficiency after months of vacuum, damaging the structure of the HEPA media since it use for filtering very small dust such as 0.3mircometer in diameter dust which can't see by naked eyes.
Further more, do you know in our air they are always much more small particles (dust) than large particles?
Do you know Only particle larger than 10mircometer can be seen with naked eye?
Do you know Only 50 out of every million are visible to the naked eye?
So i do not think most of the dust is trapped by prefilter.
And for car air filter, you definitely can choose not to change it but do you know this is affecting your fuel consumption efficiency?
Do you think after cleaning the car air filter it can restore back to its original performance? Worst case is if there is any small damage on the filter media (the white filtering medium) dust goes into engine and accumulate inside causing scratches inside engine block, increases friction and damaging the piston o-ring. Is it worth?
Hmmm..... What you think?
This post has been edited by RayV: Aug 26 2009, 12:04 PM 
Aug 18 2009, 09:19 AM
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Pls provide me more details, how to deal with u? (do u help to post?) How much is the filter? and how often the filters need to be replaced? (assuming normal, non smoking, non-aircon living room)
, UV - no comment/idea, but need to replace often kah?
Anyone have better options? (No MLM salesman please!)
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