Click on each image for a PDF of the entire project.

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Expert feedback from Nigel Harwood, Engineering Services Manager, DELTA, Dunedin and Professor Pauline Norris, University of Otago.

1. Anna, Georgia and Minolie

This looks really good and you have given it lots of thought.

Using a fine sieve is good and it should stop the dirt. I assume you are collecting the water off the roof? However, what is to stop the stopper from being spirited away?

Communication - Expert feedback from Professor Pauline Norris. I like what you have written about how to wash your hands but do you think the students will wait around til their hands are dry to put the bamboo tube back into place?

2. Caleb and Jim

You show good use of filter materials and it is also good that you have mentioned soap. Also using the elbow instead of hands ensure there is no contamination. Well done!

I have only one question - what is to stop dirt from getting into the bucket with the water?

You might need some fatty binding material to keep those soap ingredients together.

3. Ethan and Will

Using mesh to keep out the leaves is a really good idea. As is thinking about making the tank stable. An excellent project and the design is really easy to read with excellent instructions. I am not however, absolutely sure how the blocker/tap system works.

Communication - Expert feedback from Professor Pauline Norris - I like the germs. They are cute. I am not sure about the white hands. Maybe 'there you go' might be just a kiwi expression?

I think the tone of the letter needs to be a bit more simple. What happens if there is no soap and clean water available? It's best not to blame people but focus on the individual behaviour.

4. Isaac, Max and Shehryar

Very pretty! With a good diagram. I have a question. Have you tried your contraption using clay? I think clay would stop the water and sand would be a lot more effective.

The chicken wire would not be strong enough for the rocks but would work for leaves.

Where would you buy replacement springs? Or what could you use instead?

Communication - Expert feedback from Professor Pauline Norris - I like that poster and you have done a great job of it. Why exactly are you getting kids to wash their hands before going to the bathroom? Do PNG kids play with animals?

5. Shivani, Catherine and Hazel

There are some good diagrams in your project. Well done. The instructions in pidgin are cleverly done.

The only thing I would mention is that do not assume water from the ground is clean. It could actually be full of bacteria and poisonous materials. Also it is best not to put water back into a well but use it in the garden instead.

Communication - Expert feedback from Professor Pauline Norris - Cool poster. I really like it. It is great you have made a real effort and are using pidgin and gone to all the effort to translate. I am not sure whether toilets and food you show in the second poster are what you find in PNG.

7. Maddi and Briannah

There are some mighty diagrams. I see you would both make good graphic artists.It shows good use of bamboo which is a locally found, readily available material.

I am not sure how much pantyhose material you would find but cotton (like t'shirt material) or any other fabric would work just as well. With that sort of drink bottle-like pull mechanism it would be easy with someone without much education about how disease is passed from one to another contaminate it.

Communication - Expert feedback from Professor Pauline Norris. Cool poster. Your images more or less look like a loo and food and it is beautifully presented and easily read. Well done.

You two have done a clever job of presenting your material.

The funnel system is good enabling you to collect more volume of water. The foot pump is good and will save recontamination. But how does only a certain amount of water come out. It is good you have though of stabilising the tank as water is very heavy. How do you know the water in your river is clean?

Communication - Expert feedback from Professor Pauline Norris. I am worried that the end of this movie might be a bit scary for people. What is they had no choice about the water they drink? What would you achieve by showing that they will die?

It is a good idea to use bamboo as a pipe. Also charcoal will work because basically it is full of holes. I would suggest sand instead of rocks and some cotton material for the filters.

I am not exactly sure how the tap mechanism works because I can't see it and I wonder how you are going to keep the bucket clean? Chances are that it may well be stored on the dirty ground.

Communication - Expert feedback from Professor Pauline Norris. The poster is really good and shows exactly how to wash your hands but I am not sure about the picture of the village. If they were telling us how to wash out hands would a picture of Mount Cook, for example,e help us?

Nice title! Excellent graphics that are very easy to understand. A jolly good project.

Bamboo use is good because there is plenty of it in the highlands.

The sand will not filter the bacteria because it is below the taps. Mesh for leaves is also good.

Communication - Expert feedback from Professor Pauline Norris. A really cool poster and your instruction match the device you have invented perfectly. It's cool! The Pink Wash name is great with the stenciled hands on top is great too. I am not sure about your pamphlet though because I think you have to think about the audience it is for and the relevance to them.