6 replies to this topic

[Chemster980]

Hi all,

I have this question regarding conventional water filters used in home.
Equipment description: Water is poured into the plastic storage and it slowly sips through the first filter: ceramic. Then it follows from fine rocks to the coarse ones.

My question is:
1. Why are the rocks needed since ceramic is inplaced? I believe ceramic has filtered all possible particles exist.
2. Why are the rocks arrange from fine to coarse (from top to bottom)?

Thanks

[djack77494]

I'm not sure I understand the configuration of your system, but, as a general comment, you want to filter out the coarse particles first, followed by the fine particles/silt. Flow should be in the direction that achieves this. Once you have filtered out the finest particles, there is nothing left, so why have any additional filters?
Doug

[joerd]

On the other hand, coarser material can be used to support the finer stuff so that you don't lose it.

[Chemster980]

I'm not sure I understand the configuration of your system, but, as a general comment, you want to filter out the coarse particles first, followed by the fine particles/silt. Flow should be in the direction that achieves this. Once you have filtered out the finest particles, there is nothing left, so why have any additional filters?
Doug

Hi djack and joerd,

The configuration of such water filter is:

djack: I agree with you that no additional filteres is required since the ceramic filter (white item a the right) did most of the filtering. If I were the manufacturer of such product, would you agree to remove the remaining filters as cost reduction measure?

joerd: Is 'support' of larger rocks which you justified is refering to indusrial scale? And is support tat important in this home scale item?

Thanks a bunch!

[djack77494]

Chemster,
You'd normally want to get rid of the (easy) larger particles using an inexpensive coarse filter to avoid unnecessary loading of the typically more expensive fine filter. I assume you can independently change out the filters. This is a pretty typical arrangement.
Doug

[joerd]

I looked on the web site Sinolink MWF-12 and it seems that the coarser material is carbon. So the ceramic pre-filter is to prevent solids from ending up in the carbon filter. The carbon filter is not really a filter, but an adsorbent for organic materials and chlorine etc.

[practimist]

Hey Guys,

I would really appreciate if you help..

i need to purify bentonite clay colloid of turbidity 140 ntu using an apparatus made from scratch such that the following two contradictory factors are attained at satisfactory values(both)

1. Reduction in Turbidity (t1/t2)
2. Amount of pure water collected

the time is fixed as well as the incoming flow rate...

Please suggest an apparatus, and yeah no distillaition...
Thanks

Practimist