velda Giant Biofill XL, Manual

OPTION: AERATION

The first cassette has a provision to connect an air pump. Connect the aeration stone 
with the air hose to the nipple and take care that the stone will keep hanging at a 
small distance from the bottom. The air pump should be connected with the air hose 
at the top of the nipple.
By aerating the water to be filtered, it is supplied with additional oxygen. Oxygen is 
necessary to guarantee a stable development of micro-organisms. The higher the 
oxygen content of the water the more aerobes will develop in the filter material.

MAINTENANCE

Unplug the UV-C Unit from the mains during maintenance work.

If the water output of the filter decreases considerably or if the lid is leaking, the 
filter material must be rinsed out. It is generally enough to rinse it out several times 
with tap water. If the water supply to the filter is stopped for four or more hours, 
the filter material must first be rinsed before filtration resumes. This prevents the 
micro-organisms which die from an oxygen shortage from getting in the pond. It is 
recommended to use Bacterial Filterstart to start the biological process. 
In order to maintain optimum action of the UV-C Unit, the quartz glass should be 
cleaned at least three times a year. To achieve this, you should proceed as follows: 
switch off the power supply of the UV-C and the pump installation. Now carefully 
remove the quartz tube and clean it, using lukewarm suds. Any lime deposit should 
be removed with the help of vinegar. The effective lifetime of the PL UV-C lamp is 
about 7,500 burning hours. If used continuously, the UV-C lamp will consequently 
last for one pond season. It is recommendable to install a new UV-C lamp each year 
in spring. For your safety, the lamp switches off automatically when you loosen the 
screw cap (if the plug is still in the socket). You should then unplug the unit. You 
can switch the UV-C lamp back on after 3 minutes by plugging it in again. Place the 
spacer round the lamp for more stability. Only after a week or two, the output of the 
PL UV-C lamp will be optimum. This is a normal process for this type of lamp.

SAFETY REGULATIONS

UV-C radiation is dangerous! Avoid exposure to the eyes and skin at all times. 

Exclusively inspect the functioning of the lamp through the transparent screw 
cap. Exposure to harmful UV-C radiation is possible if the device is used wrongly or 
damaged. If the apparatus or its flex should become damaged, stop using the UV-C 
unit. Always install the splashproof unit in the special compartment of the filter at the 
place of the screw cap. Please be sure that it is out of the reach of children. Place the 
ballast in an area protected against the sun and rain. Exclusively use grounded sockets 

with closing cover. Prevent the plug and the receptacle form getting moist. Please 
provide a good quality grounded connection to the electric mains and use an earth 
leakage circuit breaker rated 30 mA. If the flow of the water stagnates, for example as a 
result of blockage of a defective pump, the UV-C lamp should be switched off at once.

ITEMS FOR SPECIAL ATTENTION

If water should leak from the top of the Giant Biofill XL, this can be caused by pressure 
building up inside the filter, as a result of which the water can not flow freely. Below 
you find some items which will help you finding out why the filter is leaking:
•  Place the filter above the level of the pond water and horizontally on a flat soil.
•  The filter materials should have been place in accordance with the instructions for use.
•  Inspect whether the filter material is blocked up or polluted. Especially if the pond 

water was /  is considerably green, the filter material can quickly get polluted and 
it has to be rinsed then.

•  The outflow orifice of the filter (75 mm) may not be reduced. The water must be 

able to flow out freely.

•  The maximum flow capacity of the filter is 15000 l/h. If the net output of the pump 

is larger, the water will flow over the edge.

•  Avoid back pressure. The water may not be elevated after the filter.
•  To prevent any leaking of the ball tap it is recommended to place back the cap on 

the draining opening after rinsing the filter.

As Velda can not exercise any influence on a proper installation as well as the 
functioning of the filter on the spot, Velda can not be held liable for any leakage, as a 
result of which the pond will loose water.

GUARANTEE

Except for the UV-C lamp, quartz glass, rubber rings, hose swivels and filter materials, 
Velda guarantees the correct functioning of this apparatus for a period of 

36

 months 

after purchase. In case of wrong assembly, injudicious use, damage due to frost or 
bad maintenance, the guarantee will cease. This also applies in case of use of in 
combination with oil, petrol or lubricants. The warranty expires in case of repairs 
or changes to this product that are performed by others than Velda. If a claim to 
guarantee can be laid, a dated receipt should be presented. Visit 

www.velda.com/

service

 for the warranty procedure and terms.