"ClariTec" Filter - With UV-C
      "With backwash feature"

Filter selection

To choose the ideal filter for any pond you must first know the correct environmental flow to maintain ideal water quality for your pond. (Please remember that the pond size alone does not determine the filter or pump size without first taking into account the many environmental and physical factors) 
 
3 ways to get help to establish flow

1. Fill in one of our e-mail help forms and let us do all the calculations for you

2. Give us a call 1800 607 388 for expert advice

3. Do it yourself and use our quick reference flow calculator for rough estimate

• Step one: Establish the required flow through the filter keeping in mind waterfall** height if any, or long hose**

• Step Two: Choose a filter from the chart below (Example if your pond requires a flow through the filter of 2,500 litres per hour, the Claritec 5000 would give the best result)

• Step Three: Choose a pump, they are listed below in order of quality and suitability

Recommended flow through these filters - litre per hour

**Special note, if using a waterfall or a long hose between pump and filter the pump will need to be larger to allow for the reduced flow caused by the head (pumping height, and/or hose length)   If in doubt Fill in one of our e-mail help forms and let us do all the calculations for you.
# A little under size for some pond sizes, but would work if the pond were smaller than the filters maximum volume rating.
## This pump is a little too strong, unless a waterfall over 1m is in place. However, you can never have too much pond flow, so, by releasing water back into the pond through a "Tee" and flow valve added circulation is provided for the pond.

 Aussie's additional thoughts
Tip 1: When calculating flow,  always allow about a 15% flow loss when a pressure filter is used.
Tip 2: Place the pump at the opposite end of the pond to the water return, and in the deepest part of the pond.
Tip 3: Interpet offer a powder to prime filter systems, a great way to hasten biological activity. Interpet Bio start .

Tip 4: Within reason the slower the water passes over the UV lamp and through the filter the better the result. However, you can never have too much pond flow, so, by having a slightly oversize pump and releasing water directly back into the pond or on to a feature or waterfall through a "Tee" with a valve (tap), added circulation is provided for the pond.

Tip 5: Pump - maximum pumping head. The pump supplying the filter must not have a pumping head exceeding 5m (0.5 bar)  Head over 4m could damage the filter and could even burst the container. On the other hand a pump with inadequate head may not provide enough flow through the filter
In a nut shell ....The height difference between the filter lid and a pressure free outlet must not exceed 5metres (0.5 bar). So if the filter was mounted 1m above the pond surface, the pump must not have a maximum pumping height in excess of 6m. Or if mounted 2m above the surface of the pond, the pump must not have a maximum pumping height in excess of 7m.
There is however another factor in head calculations if long hose lengths are used, see "Friction loss in hose" under How to choose your pump / filter  if your hose will be more than 3m.

Clearwater guarantee - or your money back
Provided a correct size** Claritec filter with UVC is operated using the ideal* water flow and head requirements shown on this page, and that the UV lamp is replaced every 12 months with an identical Philips lamp, a guarantee of clear water visibly free from suspended algae is offered.
*Excessive or insufficient flow will dramatically reduce the UV lamps ability to control suspended algae.
**Suitable for a pond, taking into account sun, fish stock, plants, climate and other environmental factors