NSTW 2012: Clay water purifier


This is the clay water purifier also known as ceramic pot-type water filter (CPF). This technology is developed by the Department of Science and Technology – Industrial Technology Development Institute (DOST-ITDI) to purify drinking waters.

This water purifier is specially formulated with red clay coated with nano anti-microbial agents that purifies water from its natural sources such as deep well, ponds, spring, etc., making it safe for human consumption.

The development of this technology was inspired to utilize the locally available materials in the country and to produce an affordable water purifier available for the public. Congrats to DOST-ITDI for this innovation.

This technology was also featured in the National Science and Technology Week held at the SMX Convention Center in SM Mall of Asia last 10-14 July 2012.


  1. If the coated clay itself purifies the water, does this mean there is no further technology involved in the process? That almost sounds too good to be true. But just how often can the same purifier be used? Is it a one time only thing or does the coating need to be renewed regularly?

  2. yes. the clay itself is made of nano-antimicrobial agents that can purify water making it safe to human consumption

    • Well, that’s comforting to know that it is safe for human consumption. Although, wouldn’t it have a limit on how many times you’ll be able to use it until nano-antimicrobial agents loses its effectivity?

  3. I have a few questions: 1) How is this technology any different than the ceramic pot filters that organizations like RDI-Cambodia, Hydrologic, Potters for Peace, Potters without Borders, and several other organizations have been producing the last 10 years in more than 20 countries? 2)Typical nano-antimicrobial agents would be nano-silver. This is what the above organizations used. Silver has been used for literally thousands of years as a biocide. What are you using? 3)It sounds like your interest is in helping the rural poor. Will be be sharing the details of your improvements with The Ceramics Manufacturing Working Group (an independent association of NGOs and non-profits) who are producing ceramic pot filters all around the world, so we can more effectively help get clean water to the rural poor?
    Thank you, Derek

  4. Would you mind checking with the author again. I'd really like to know the answers to my previous questions. Thanks

    • You may contact Dr. Nuna Almanzor of the Industrial Technology Development Institute of the Department of Science and Technology at the following numbers (632) 837-3167, 837-2071 to 82
      loc. 2218, 2215 or through e-mail at nea@dost.gov.ph.

  5. When some one searches for his vital thing, therefore he/she desires
    to be available that in detail, thus that thing is maintained over here.

  6. If the covered clay-based itself cleans the h2o, does this mean there is no further technological innovation engaged in the process? That almost appears to be too excellent to be real. But just how often can the same cleaner be used? Is it a once only factor or does the covering need to be restored regularly?

  7. Two things:
    1. I feel it is important to point out that the ceramic pot filter was first developed in 1981 by Dr. Fernando Mazariegos at ICAITI (Instituto Centroamericano de Investigación y Technología Industrial) in Guatemala.
    2. It is not correct to call it "clay" water filter. It is "ceramic". Clay is the original material and it dissolves in water. Ceramic is made by heating clay above about 700 C over a period of time. Pouring water into a clay water filter would result in a pool of mud at the bottom of the receptacle because water dissolves clay.

    • First, probably Dr. Mazariegos have made the first ceramic pot filter and were grateful for that wonderful invention. This one now is infused with other technologies like nanoparticles to improve its filtration process.

      I also would like to comment on your second point regarding the use of "clay." Yes clay was the raw material for this technology, and probably ceramic is the best "technical" term to use. However for editorial purposes, it is important to consider what people might understand better (popular). Using clay for this matter is not wrong anyway.

      • It appears that the filters are of a solid material, not clay. If I'm wrong and they aren't fired to a high temperature to make them more inert then please accept my apology. If have been fired as it appears they are ceramic and not clay. Its not a popular vs technical term. Coffee cups are ceramic, not clay. Flower pots are ceramic not clay. Its more about understanding that the two are chemically not the same thing just as understanding a butterfly is not a caterpillar.

  8. with regards to the ceramic filter developed by ITDI-DOST, it made up from local red clay which is abundant in the Philippines. we incorporated some combustible materials screened into a specified mesh, which upon firing will dictate the pore size. the anti microbial agent that we used is the typical nanosilver. in terms of its shelf life, it is actually about a year but it depends on how it is being used, and the raw water being filtered. however, included in the system is a procedure manual as well as the maintenance manual. dr. chitwood, you're right that it is more appropriate to refer it as ceramic filter rather than a clay filter. one of the objectives of the project is to really share it to the areas in the philippines where potable water is a problem. as of now, we are transferring the technology thru our regional offices so that the local potters can learn to produce it and eventually be available in the countryside.

  9. This indicates that the filtration are of a strong content, not clay-based. If I'm incorrect and they aren't shot to a warm to create them more inert then please agree to my apology. If have been shot as it seems to be they are clay and not clay-based. Its not a well-known vs specialized phrase. Java glasses are clay, not clay-based. Plant containers are clay not clay-based. Its more about knowing that the two are chemical not the same factor just as knowing a butterfly is not a caterpillar.

  10. This suggests that this purification usually are of any robust articles, not necessarily clay-based. If Now i'm incorrect plus they are not chance to some comfortable to create all of them a lot more inert then you should say yes to the apology. If are chance since it is there're clay but not clay-based. It's an excellent well-known versus specific key phrase. Capuccino cups usually are clay, not necessarily clay-based. Grow storage containers usually are clay not necessarily clay-based. It's a lot more with regards to knowing that each usually are element not similar element as figuring out a new butterfly is just not a new caterpillar.

  11. When the covered clay-based themselves wipes the mineral water, really does this imply there isn't a further know-how operating in the process? Of which almost appears to be too exceptional to become genuine. Yet precisely how typically can easily exactly the same cleaner supply? Will it be a new the moment just component or perhaps really does the addressing ought to be restored often?

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