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Sand Filter Media Specification


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#1 carine

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Posted 15 April 2019 - 08:48 AM

Hi All, 

 

We would like to replace sand filter media with new ones. Our media consist 1 layer of Antharicite 2 layer of sand. my question is what are the spec that u all looking into (food safety aspect) when choosing Antharicaite? Thanks in advance



#2 Charles.C

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Posted 15 April 2019 - 10:24 AM

Hi All, 

 

We would like to replace sand filter media with new ones. Our media consist 1 layer of Antharicite 2 layer of sand. my question is what are the spec that u all looking into (food safety aspect) when choosing Antharicaite? Thanks in advance

 

Google = no hits.

 

Typo ?, eg - Anthracite ?

 

http://www.tohkemy.c...em/roka_p1.html


Kind Regards,

 

Charles.C


#3 SQFconsultant

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Posted 15 April 2019 - 02:20 PM

Hi All, 

 

We would like to replace sand filter media with new ones. Our media consist 1 layer of Antharicite 2 layer of sand. my question is what are the spec that u all looking into (food safety aspect) when choosing Antharicaite? Thanks in advance

 

Spelling of the carbon material name is incorrect --- Anthracite literally "a type of coal", is a hard, compact variety of mineral coal that has a high luster.

 

You will be looking for high luster and uniform sizing - you need to contact the manufacturer of your system to get the best match.


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#4 carine

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Posted 16 April 2019 - 02:11 AM

sorry typo..should be Anthracite is a type of coal, chemical name is silicon dioxide . Wondering how do we proof that is it food grade?  



#5 Charles.C

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Posted 16 April 2019 - 02:18 AM

sorry typo..should be Anthracite is a type of coal, chemical name is silicon dioxide . Wondering how do we proof that is it food grade?  

 

Many other types of filter media are available (for example anthracite, birm) depending on the type of water treatment desired.

Water processed by any filter requires further purification or disinfection before it can be considered to be safe drinking water

 

http://www.agr.gc.ca...d=1189695164631


Kind Regards,

 

Charles.C


#6 EagleEye

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Posted 16 April 2019 - 07:10 AM

Hi All,

Thus we conclude the use of Anthracite (or any other relevant alternative in filtration process) seems limit the scope to a quality point rather than a safety control (?)... 



#7 pHruit

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Posted 16 April 2019 - 09:50 AM

Hi All,

Thus we conclude the use of Anthracite (or any other relevant alternative in filtration process) seems limit the scope to a quality point rather than a safety control (?)... 

I'd personally still be inclined to ensure that the anthracite is a suitable food grade in terms of impurities, or absence thereof. My understanding is that there is potential for coals to contain various heavy metals and also some radioactive isotopes, and so not ideal for food use!
 



#8 carine

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Posted 20 April 2019 - 02:04 AM

Hi All, 

 

I have received lab test report on anthracite as per attached, but i have no clues if the report show purities of the media. "m appreciate if anyone could put input on this report. Thanks in advance 



#9 Charles.C

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Posted 20 April 2019 - 06:31 AM

Hi All, 

 

I have received lab test report on anthracite as per attached, but i have no clues if the report show purities of the media. "m appreciate if anyone could put input on this report. Thanks in advance 

 

No attachment.


Kind Regards,

 

Charles.C


#10 carine

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Posted 22 April 2019 - 01:44 AM

Dear All, 

 

Attachment uploaded. 

Attached Files



#11 pHruit

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Posted 23 April 2019 - 08:30 AM

To me that looks more like (part of) a specification than an actual analytical report - most of the parameters appear to detail tolerances, rather than measured values. I suppose it could be an analysis with the uncertainty quoted in an unusual way, or a composite of analyses of multiple samples showing a spread of results.

In any case it doesn't seem to actually confirm food-grade status or maximum levels for contaminants that could have food safety implications.

I'd be inclined to ask for a full specification that includes confirmation of food-grade status, and if possible some analysis for e.g. lead content. If you know where it is mined from then you can also probably do a bit of googling to see if there are any other potentially concerning impurities that could be likely, and that you'd thus need to also consider.



#12 Charles.C

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Posted 23 April 2019 - 10:47 PM

sorry typo..should be Anthracite is a type of coal, chemical name is silicon dioxide . Wondering how do we proof that is it food grade?  

 

Hi Carine,

 

I suggest yr requirement may be based on a misconception.

 

I do not see any manufacturer of anthracite for filtration claiming their product is "food grade". ? eg -

 

Kleen Industrial Services is a direct distributor for anthracite products. Kleen Blast Anthracite filter media is produced from the highest quality anthracite available to ensure the physical characteristics of hardness, durability and performance. Anthracite typically produces consistent improvements in turbidity removal because, in part, to more efficient solids loading. Low uniformity coefficient media also produces smaller changes in effluent turbidity during periods of peak influent turbidity. Products meet or exceed the NSF/ANSI Standard 61 for Drinking Water System Components, as well as AWWA Standard B100-01.

Physical Specifications
Effective Sizes: . 60mm - 1.6mm
Uniform Coefficient: 1.3 - 1.7
Specific Gravity: 1.3
Moh's Hardness: 3
Density: 50 lbs per cubic foot
Moisture: <2.0%

https://www.kleenind...anthracite.html

 

What is "food grade" anthracite ?

 

Yr query may be equally directed towards the claimed, attained quality of effluent when the product is implemented in yr filtration system ?

 

PS - an additional example specification -

 

Attached File  anthracite for use in water filtration.pdf   489.64KB   4 downloads

 

PPS - correction - I did see one supplier of "food grade" anthracite (terminology unexplained) -

https://www.alibaba....d-charcoal.html


Kind Regards,

 

Charles.C





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