The Velda air pump range is built to be solid and reliable for all weather conditions. It has a real rugged and professional feel, that will last you for years! All of the Silenta Air pump range comes with 9mm air tubing and giant air stones, which can be purchased separately if you need more. Being made from cast iron it looks as if the Silenta is going to have a loud tinny buzz to it, it is however the total opposite from what you expect it's probably the quietest air pump on the market. The diaphragm design that velda have produced lead it to being probably the quietest air pump on the market for the amount of air output that you get.

The Silenta air pump can go to a depth of 2.5m just over 8ft in depth* meaning that there really isn't going to be a domestic pond that will be too big for these air pumps! They are designed as an air pump to be used on a pond, but can also be transferred to be used within and aquarium for those of you with a larger than normal aquarium.

The outer shell on these Silenta air pumps is probably the toughest you will find, it is made from cast iron so it will endure pretty much anything the weather can throw at it!

If you have been experiencing problems wtih your Silenta Air pump 9 times out of 10 this is going to be a diaphragm problem, they may have slipped, torn or become worn over time. The diaphragms are easy to change and can be purchased as a spare, so if you need to order a new set please just give us a call. The Silenta air pump models are all very similar and by following these pictures you will be able to change the diaphragms. In the left hand picture you will see a representation of the diaphragm kit that you will recieve. This comes with the diaphragm cases at the top of the picture, the two rubber diaphragms and the foam air filter (this stops any dust getting into the motor) Shown above right is the pump, you can see the four phillips head screws one in each corner, removing these will allow access to the motor and the diaphragms.

Once inside the Silenta Pro air pump, on either side you will be able to see the diaphragm housing.These are secured into place by four screws. They are all phillips head, and removing them will give you access to the diaphragms. You will probably find that the housing is still in a good condition, if not these can be changed by removing the black air flow tubing and re-attaching to a new housing. Once all the screws are removed you will be able to see the diaphragm and its holding locking nut like in the right hand side picture.

To remove the diaphragm from the Silenta, you will need some long nose pliers. You will notice that there is a red wax seal on the nut that is holding everything together peel this away with the pliers and then un screw the nut. Make sure you keep all the parts the same way as they came out. (this makes it easier to reassemble) You can now install a new diaphragm and repeat the process to fit the air pump back together again! To clean out the air filter (this is always on top of the Silenta air pump) just remove the protective cover, take out the foam, rinse and then dry and replace. 

*(models 4800 and 6000)