my first instructable. i've made a smal pond filtering system from scrap. Using a toxic waste inviromentbox that are in a lot of Belgium peoples houses without any use. I only have to buy a filter an some connections. The choice i made was because this box is very strong en initiate resistant against heavy products. my largest filter is made of scrap from flexibele tube protection. between te small tubes and the black filter i placed a filtersack with very small argex ( or waste of cokes). (not in pictures).cokes also do the work.