Designed for the minimum amount of construction time, and with the minimum amount of joints, this Fluid Bed Filter can form the basis of your filtration system, or act as a secondary biological filter.

Remember the inlet does need pre-filtering, especially if you have coral sand in it (recommended) as else it will clog. This could be the output of a vortex filter, through a suitable sludge filter, or from the 'back end' of a conventional filter set up. The issue is discussed on a number of sites, suffice to say it needs reiterating.

Experiments with filter media indicate that coral sand offers the maximum surface area of any currently available media, and the effect on hardness in the pond is negligible. As such we'd recommend it, but if you know different, or have experience with other media, please feel free to contact me or discuss on the forum.

Specification:

As primary biological filter approx 2000 UK gallon pond

As secondary biological filter approx 4000 UK Gallon pond

Flow rate - approx. 500 gall/hour

Minimum list of components: italics denotes the name used in the text. Part No's are from the Gerberit Terrain range.

1)  1 - 136.4 110mm access cap (access cap)

2)  2 - 120.412.15 110mm / 40mm single bossed pipe (spigot outlet) (main fitting)

3)  1 - 800mm length 110mm translucent PVC pipe

4)  1 - 40mm non-return valve and inserts

5)  1 - 40mm flow regulation valve

6)  1 - 110mm blanking plug

7)  1 - 110mm tank connector - flat (base unit)

8)  1 - tube solvent weld

9)  1 - 202.15.91 40mm knuckle bend (elbow)

10) 2 - 40mm hosetails

11) various lengths of 40mm pipe (1 60mm, 1 100mm, 3 x 75mm, 1 380mm, 1 65mm)

12) 2 - swept tee

13) pyrex/glass/ceramic anti-abrasion dish XXmm diameter

14) xxKg Coral Sand

Items 1-12 from any DIY store or Plumbers merchant, item 13 look for an ashtray or similar to fit (A pyrex ramekin dish fits nicely).


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