| Concepts:
water, filter, pond, biofilter, bacteria, fish, solids, Alfagrog, litre,
surface area, foam, waste products, filtration, plastic tubes, purify.
Summary:
- One of the most fascinating parts of pond keeping for the enthusiast is
the management of the pond water quality.
- This filter does the job of removing solids and particles that remain
suspended in the water, and if there is an automatic pool cleaner "kreepy
krawley in South Africa" it also removes those solids that settle on the
bottom.
- In this way the water remains perfectly safe to swim in the because the
chlorine kills all the harmful bacteria and sanitises the water.
- That which is eaten by the fish is partly digested and partly expressed
as a waste product, which sinks to the bottom of the pond.
- At their simplest these biofilters are literally black or green boxes
holding sponges, brushes or other means of trapping particles.
- The boxes also contain plastic tubing often called Flocor, plastic
balls, other weird plastic shapes or if you are lucky the boxes contain
Alfagrog.
- A biofilter first and foremost is designed to purify water and the
secondary purpose is to remove the solids that make water cloudy.
- Foam sheets by virtue of the many small holes in them also provide
surface on which bacteria can grow as well as acting as a mechanical filter
to remove solids.
- By far the best means of getting large surface area into a small black
box biofilter at low cost is to use porous ceramic materials like "Alfagrog".
- metres per litre depending upon the particle size compared to 0.2
square metres per litre for plastic tubes.
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