Oase Filtral Fountain Aeration Set

Oase Filtral Aeration Set 70364: a venturi attachment, not a complete pond filter

The Oase Filtral Aeration Set (Oase part 70364) is a small accessory for compatible Filtral UVC all-in-one pond filters. It uses water already moving through the Filtral outlet to draw air into the return flow. It does not contain a pump, filter, UVC lamp or electrical supply. If you are replacing a missing or damaged aeration attachment, checking this distinction before ordering will save you from buying the wrong part.

Some Filtral packages already include an aeration attachment. Check the parts supplied with your own model and look at its outlet and fountain assembly before buying a second set. Oase lists 70364 as a Filtral accessory or spare, including on the Filtral UVC 3000, 6000 and 9000 model diagrams. Filtral generations and UK pack contents have changed, so the number on the filter’s data plate is a more useful compatibility check than a photograph of a similar-looking fountain.

What the attachment does

The Filtral pump pushes pond water through its outlet. At the aeration fitting, moving water draws air through the small tube whose open end is kept above the pond surface. The resulting air-and-water stream returns to the pond. This is the venturi principle: the attachment uses the existing water movement, rather than a separate motor, to introduce bubbles and some local circulation.

A visible trail of bubbles helps you confirm that the air path is working, but it does not measure the pond’s dissolved-oxygen level. Bubble output changes with the Filtral’s condition, outlet adjustment and the air tube’s position. In hot weather or a heavily stocked pond, assess the whole aeration arrangement. For a dedicated air supply to a diffuser or biological filter, compare our pond air pumps instead of assuming that this small venturi can do the same job.

Check compatibility before fitting

If you are ordering a complete filter, compare the Filtral UVC 3000, Filtral UVC 6000 and other models in our Oase Filtral range. Those are powered underwater filtration units, whereas this listing supplies the aeration accessory only. The Filtral Fountain Nozzle Kit is a separate fountain-display accessory; it is not a substitute for the aeration set.

Fitting the venturi without losing the air supply

Isolate the Filtral from the mains before handling anything in the pond. Locate the compatible fountain/outlet regulation fitting and compare it with the connection shown in your model’s instructions. Fit the aeration injector as directed, without forcing the threads or plastic clips. Route the air tube upwards with its intake above the normal waterline. It must not become submerged when the pond rises after rain or when the fountain is adjusted.

Keep the tube clear of kinks, leaves and places where it could be pinched by coping or a lid. Arrange it so the end can be checked during routine maintenance. Reconnect the Filtral only after the assembly is secure and the pump can draw water normally. Observe the bubble stream, the fountain height and the water return for a few minutes. If the fountain display is part of your setup, adjusting one outlet may affect the water available to the other; set the display for the result you want rather than assuming the previous valve position will remain suitable.

Do not leave electrical plugs or transformer connections where they can be flooded. Follow the instructions and electrical safety arrangements for the complete Filtral unit; the 70364 attachment itself has no separate power lead.

If bubbles stop appearing

First check whether the air-tube opening is above the water and unobstructed. Look for a kink or a tube that has slipped off the injector. If the fountain and water return have weakened as well, clean the Filtral intake and filter media according to the filter’s own manual. A restricted water path gives a venturi less flow to work with. If the water stream is normal but the air path remains inactive, inspect the injector for debris or damage before replacing parts. Clean gently and refit the pieces securely; do not enlarge a nozzle opening with a sharp tool.

Remember that the bubbles are produced only while the Filtral water pump is running. If oxygen demand is critical overnight, or the filter is switched off for cleaning, this fitting cannot provide independent aeration. A separate air pump and appropriately sized diffuser provide a different, continuous route. Fish behaviour and a proper oxygen test are more informative than the appearance of the bubbles alone.

Choosing between a venturi and a dedicated air system

This attachment is a tidy way to add some air and movement when a compatible Filtral already circulates the pond. It is especially useful when replacing the original fitting, keeping the installation compact and avoiding another electrical appliance. A dedicated air pump is more flexible when you need to place air stones around a large pond, supply a moving-bed filter or keep aeration running independently of the Filtral fountain. Compare the equipment by the job it must perform; there is no manufacturer-stated oxygen-transfer rating for this individual accessory on which to size a heavily stocked pond.

Before ordering, check the exact model and generation on your Filtral label and whether the original aeration part is already in its carton. If you need a spare but cannot identify the outlet, a photograph of the filter’s label, fountain stem and missing connection point will help us match the part. The fitting is sold separately from the complete filter and from the fountain nozzle kit.