Home » Information » 11. Skimmers
Evaluation and testing ..........Skimmers
We at COASTAL KOI consider product evaluation very important within our overall sales strategy, with a policy of only offering for sale items that we consider suitable for the purpose and to the best of our ability correctly described.
By carrying out our own in house evaluations on most products we sell and applying a high percentage quality control system of checking, we try to meet the needs of our customers.
When dealing with Top quality products by leading manufacturers : The names Aquamax Sequence Nexus Etc. spring to mind, the need for quality checks and evaluation is not quite so important. We tend to concentrate our in house evaluations on the lesser well known budget priced imported items.
Please make special note of dimension below Forward edge of access cover to pond wall. This could be relevant in your design as access to the lid has to be maintained.
STANDARD MODEL COLOUR BLACK
OVERALL >> HEIGHT = 350MM / DEPTH = 275MM / WIDTH = 220MM
THROAT>> HEIGHT = 130MM / WIDTH = 145MM
FRONT FACE (approx)>> HEIGHT = 200MM / WIDTH = 200MM
DIMENSION. Forward edge of access cover to Pond Wall = 45mm
PIPE CONECTION>> 1.1/2" NPT
WIDE MOUTH MODEL COLOUR BLACK
OVERALL >> HEIGHT = 350MM / DEPTH = 325MM / WIDTH = 355MM.
THROAT >> HEIGHT = 130MM / WIDTH = 295MM
FRONT FACE (approx)>> HEIGHT = 190MM / WIDTH = 355MM
DIMENSION. Forward edge of access cover to Pond Wall = 130mm
PIPE CONECTION>> 1.1/2" NPT
DELUX EXTENDED NECK WIDE MOUTH MODELCOLOUR WHITE
OVERALL >> HEIGHT = 420MM / DEPTH = 575MM / WIDTH = 500MM.
THROAT >> HEIGHT = 150MM / WIDTH = 390MM
FRONT FACE (approx)>> HEIGHT = 205MM / WIDTH = 450MM
DIMENSION. Forward edge of access cover to Pond Wall = 325mm
PIPE CONECTION>> 1.5" BSP(F): 2.0" BSP(M):50mm SOLVENT WELD
All skimmers can be fitted with a >>>>> Stainless steel guard.
Below are some of our findings from Recent Trials and Evaluations
SUITABILITY and POSITIONING.
When the surface area / Volume of pond / pool are of average proportion.
The Standard is generally suitable for up to approx. 4500 gls.(20,000 ltrs.)
And the wide mouth generally over 4500 gls.(20,000 ltrs.)
The main factor to take into account is the overall area of pond or pool as it is only the surface of the water being skimmed and not the total pond water.
Therefore a large area with small volume would skim less efficiently than small area and large volume.
The size of pump being used will also affect the outcome. As will the position of any trees in the vicinity.
Try to position of skimmer relative to the general flow of water created by return water from filter or any water falls etc. This is fairly important and would generally be decided after observation as to which area the majority of surface debris tended to gather nearest the edge. The generall prevailing wind might also be a factor in the equation.
The draw on surface by the skimmer at this point would then clear the debris more efficiently.
This can only be brief as it will vary from one installation to another, and be impossible to clarify for all.
Can be fitted to concrete /fibreglass or liner
Fits vertically in Wall at water level (can be used with liner) (Top of the skimmer would be approx 100mm above this (water) level.
The distance from wall to top access cover varies with model please see Approx dimension wall to cover above.
Will require a pump to draw the water from the surface this would need to be below the skimmer therefore an excavation would be needed if pond / pool is at ground level. Can be plumbed in to an existing pumped circuit with appropriate valves, assuming pump is orientated in such a way to accept this and is sufficiently powerful
Because only the surface requires skimming a hinged weir plate is fitted, this floats up and down with the water level increasing the flow rate from the surface.
They are easier to fit when pond or pool is partially above ground but can be fitted when at ground level.
Can also be fitted to an established pond or swimming pool but of course would require an excavation where the Skimmer is to be positioned
If you are reasonably competent at DIY in the building and plumbing fields and have access to some tools fitting should not create to much of a problem. Fitting instructions are includedWe are only a phone call away for assistance
The length diameter ( 1.1/4? - 1.1/2? min ) and type of the pipe used plus any system head loss will have a huge effect on the overall performance.
Where reasonably short low head loss pipe work is involved and on relatively small set ups The skimmer will actually work with a fairly small pump with a rated delivery spec.as low as (2000 Ltrs/hr @ max. head around 2 ? 3 mtrs). This would necessitate being run at a head of about 0.5 mtr max to work.
At the upper end especially with higher head losses somewhere around 6000 - 10.000 Ltrs/hr would be needed. Plus of course the larger the pump the better the skim.
The layout of your system plus surface area , and the amount of debris your pond/pool collects, will also have a bearing on the size of the pump required. (The surface area is more relevant than total volume of water)
Therefore as a general overview a pump anywhere between 2000 and 10,000 Ltrs / hr would be required depending on individual set ups.
The suitability of any pump in our opinion has to be a balance between initial costs balanced against running costs.
Budget priced pumps normally have higher running / maintenance costs and are not always the best choice,
The Sequence and Aquamax range of pumps ( although higher initial cost ) do score very well in this area being low wattage and therefore cheap to run and also reasonably reliable. They are also a very popular choice for this type of application.
we now have our own range of eco 'S' pumps. that will perform as well as the above at a fraction of the cost
MODIFICATION FOR GRAVITY SYSTEMS
Most wall skimmers can be modified to incorporate a 3" outlet so they can be used in Gravity fed filter systems. For this to work properly the filter or filters must have sufficient capacity for both systems to function.
All the above specifications relate to the Flush wall mounted type.
BELOW IS THE VELDA FLOATING SURFACE SKIMMER
The new in pond Velda floating skimmer comes complete with it,s own built in pump.
Easy to fit and easy to clean c/w 10m of cable.
Certainly not a great deal of evaluation needed for this one just a good quality piece of kit, with a name that speaks for itself.
For more PICTURES and information on all the above please goto >>>>> Pond construction
Any stated specification are for information only and do not represent anything other than our own interpretations.
This page is still under construction with further information added as and when. Thank you for looking.
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