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Air Pumps & Accessories

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Medo Piston Pump Service Kit
Medo Piston Pump Service Kit
  • Maintenance Service Kit includes all parts to carry out a service
  • Service Kit: 2 x Piston Assemblies, 4 x End Cover Seals, 1 x Air filter
  • Service is easy to do and takes approximately 20 minutes start to finish
  • Yearly change air filter
Charles Austen Linear Air Pump
Charles Austen Linear Air Pump
  • The Enviro Series Charles Austen Air Pump is a linear diaphragm pump that provides a clean, oil free air source. It is notably quiet and exceptionally efficient.
Service/Repair Kit for Charles Austen Diaphragm Pump
Service/Repair Kit for Charles Austen Diaphragm Pump
From:  £48.25
  • Maintenance service Kit with all parts to carry out service on each model
  • Kit includes diaphragms, magnets and air filter as appropriate
  • Service is easy to do and takes approximately 20 minutes start to finish
Medo Piston Pump
Medo Piston Pump
From:  £350.00
  • Medo Piston Air Pump with unique floating piston technology
  • Models: 60 / 80 / 100 / 120 / 200 - litres per minute
  • Medo floating piston pumps will run for 4-5 years before a major service
  • Yearly change air filter

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The tables below have been obtained after more than 40 years experience of how much oxygen is required by bacteria and aquatic life under all conditions.
Remember, the higher the water temperature, the less dissolved oxygen (DO) the water can hold.

Pond Air Pump Sizing

Volume in gallons











Volume in litres











Litres air / min to maintain DO Safe Levels











Lake Air Pump Sizing
Use 1 hp motor per acre


Featured Reviews
The best blanket weed remover
26 March 2023  |  John

Removing blanket weed.
I have been trying to kill blanketweed for years and have tried everything now I have discovered Hydra I don't have a problem.
Fantastic product.

23 March 2023  |  Mike

Struggle with dpf and eml since October. Talk with my mechanic he tried to force regeneration did it after two weeks light shows up again. Audi garage told me that it will cost me 2k so is March and found that product decided to give it a go. I put two bootles in to 40l of diesel. Today is a third day done maybe 150km since and what!?!?!?! The light on the dash gone 👏👏. So I have ordered another two. It does what it says.

Great for water feature
13 March 2023  |  Amanda

Does the job

It's work as add on like premium quality fuel
12 January 2023  |  Zafri

Itís work as itís described, more mileage , every 10 ml save me about £10

Overcomes murky water
07 December 2022  |  Christine

Use it in my water feature to keep the water clean. Just need a drop or two every month but remember donít use with plants or fish.

Great job for keeping fountain clean!
26 November 2022  |  Ben

My water feature was starting to get algae build up and a bit grubby but as soon as I started using this I never have to change the water - it makes it so crystal clear and reduces the build up! Highly recommend - just keep away from pets!

My Daisy is blossoming
06 June 2021  |  Jessica

I have had Daisy flowers in my garden for years now, and this year I have decided to give a go to fertilizer. I have been a Hydra customer for a while now, and I know they have quality products and great service, and when I saw that they have a new fertilizer product for sale I decided to give it a shot. SO GLAD I DID - my garden looks so beautiful this year - and I have been using it for only a week! Cannot recommend it enough!

Was skeptic, but its brilliant!
24 May 2021  |  John

Hello guys
What can I say, over the years I have used products that claim to kill off blanket weed, so when I used your product it was used with some scepticism, well, that was short lived, it done exactly what it said on the tin (or should I say bucket), it made the pond look messy for about 24 hrs, after that, it was obvious that it was doing its job, brilliant, and only too happy to recommend, the fast delivery was appreciated.
John Burden

08 December 2020  |  Jo

Both the Isuzu and the Webasto on my boat are running much smoother, latter was sounding terminal', there was a big blue smoke first time I turned engine on, and that presumably was injectors cleaning.
Technical advice excellent (phone)
Sales and delivery excellent
Packaging excellent
Website good design
Videos suited to American hype market, but there is a big range of products, and I overcame my cynicism to buy. Product was recommended on a canal forum.
Note .... There were three products that suited my purpose which is why I phoned technical, it seems Diesel Boost will clean Webasto and engine, and stabilise diesel stored in tanks and in containers.
I have enough for a year, will purchase again

Definitely worth it
07 November 2020  |  Anamaria

Let me be clear here, I am a natural sceptic. This product sounded nice, but I wasn't bought right away.
I am driving 10 years old Volkswagen Golf, MK6. Also, I am a young driver, and I didn't think I was going to notice any difference.
Boy, was I wrong. I added the first dose ever, I notice a difference within the first 10 minutes of driving. My engine was smoother, and when going really slow in second gear, instead of my engine struggling and sounding like it was going to stall, it was pushing me forward.
Also, next morning, instead of the usual first 5 mins being very loud when turned on, it was again, smooth and silent, like it was turned on for some time.
This product is amazing, I am definitely using this in the future. Price is affordable and worth every penny. I would give 10 stars if I could.