Do I need a filter in my wildlife pond

Hi, I am new to this site and gardening. Have recently moved to a new home and am in the process of doing a wildlife pond which is 2.5m x 1.5m x 0.5m depth. i am having a small cascade waterfall going into the pond and will be adding various pond plants too i will be having a bog garden and also a wild flower garden.... what i need to know is do i need a pond filter and if i do would i get one with a uv lamp or would a uv be detrimental to good bacteria beneficial to the wildlife using the pond ie. newts, frogs, toads etc Any help/advice would be much appreciated

No need for a filter in a wildlife pond, so long as you keep at least 60-70% of the surface water in shade.

This thread below may have some useful information with regards to water quality.

http://www.gardenersworld.com/forum/problem-solving/pond-lacking-in-oxygen/2678.html

theres no need for one as mentioned by mello but as you are making a waterfall and require a pump anyway just run that into a home made chamber filled with floss and filter media made from a plastic tub with holes drilled then you could always have fish as an option good luck

I hope you get a pump with a very fine mesh you dont want all the underwater wildlife getting sucked up and churned up in the impeller, there the core to your wildlife pond.

If you've not finished the build how about running the cascade from it's own reservoir and having the pond separately? Daphnia keep my wildlife ponds clear but they won't survive a pump or fish, although they thrive despite a bit of use from mallards! they also do the job in the open, sunny amphibian ponds with little shade..