I am collecting samples of farm derived waste water for my PhD project. Many of them are contaminated with cow dung. I need to filter them to 0.45um for a number of procedures, however, after centrifuging they still take a long long time to filter. I get a lot of samples to filter after each sampling trip and thus time is a commodity that I can't waste.

At present I centrifuge them and then run each sample through a 0.45 filter, however I usually have to change the filters a number of times just to filter one sample. I am happy to use more than one sample but surely there is a better mix of sizes that would work instead of wasting all the o.45um filters.

Anyone got any ideas or tips?

Thanks very very very much.

Gregg

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