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I know you can now buy the best glass filter media in the USA. The only one you should consider using is Activate from Dryden Aqua (manufacturers) look on youtube for US distributors.
Why is Activate so much better? All of the other glass is simply crushed or sometimes glass spheres. I have worked with some that gave me little tiny cuts from the fine shards, these were always between my fingers where the skin is thinner but its never happened with Activate.
More important than that is the Activate glass media is treated in a special way to activate the surface to attract particles (adsorb) which are then washed away with the backwash. The surface of the activated glass will not support bacteria so it is self sterilising. The problem with sand and other non activated glass is that it will support bacterial growth and that leads to clumping and channeling that allows a path for unfiltered water to pass through the filter back into the pool.
Activate is used by Scottish Water in the sewage treatment plant, after 10 years the media was removed and examined and the surface was completely clear of bacterial growth, one tough test we will never need to go through!
It's not just what goes into the filter that counts but what comes out when you backwash it. Activate washes cleaner so less buildup of gunk in the filter.
My only comment is the pool industry tends to try and rush filtration, if you slow it down with a variable speed pump you'll get much better results.
Read about one test carried out by a French laboratory on glass media.
The common sand filter for pool filtration has been used for years and is a staple in the pool industry. The filters themselves don&#;t change much, expect for things like ClearPro Technology, but the media inside does.
For years the standard media that goes in a sand filter is... you guessed it SAND. Over the years there have been changes, fads, improvements; however the one that seems to have stuck is recycled glass media.
Sand will filter to roughly 30 microns.
Some glass media manufacturers state that the glass will filter down to 5 &#; 10 microns which is less than a cartridge filter. We aren&#;t sure about those claims, however it does filter better than sand as the sand is negatively charged and allow smaller particles to cling better than the sand.
Slight edge to Glass Media
A swimming pool services company will sell sand for roughly $10 and glass media for $25 &#; $40; both per 50lb bags.
Glass media since it is finer will only require roughly 50% of the filter capacity to be filled.
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Doing the math, Sand is more affordable.
Sand media needs to be changed out every 4-6 years depending on the water and debris load that is going through the filter.
Glass media claims to last forever, which I doubt, however we have seen glass media system that are over 10 years old and still performing.
Glass Media is far superior... as a result might take the edge in price if you plan to stay in your house a while.
Sand will require longer backwashing to clean the dirt out of the system as there is more volume of media to go through.
Glass media will backwash quicker as the material is lighter and less dense, so it floats better, resulting in faster cleaning. Faster cleaning also means less water usage.
Glass Media is the better option for ease of backwashing.
Glass seems to be the winner in all basic categories except in price, which makes sense. Better product = more money.
If you plan on staying with the house and pool for more than 6 years, glass media might the choice as you will not have to pay to replace it again. Sand media will need replacing and if you use a swimming pool services company, you will also have to pay for labor.
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