




💦 Keep your pond pristine and your fish thriving—because your aquatic ecosystem deserves the best!
Blagdon Extra Strength Concentrated Formula is a 1-litre liquid treatment designed to combat fungal and bacterial infections like finrot and mouth rot in pond fish such as goldfish, koi, and carp. Safe for wildlife, it features a no-mess dosing chamber for precise application over a 5-day treatment period, effectively treating up to 9,092 litres of pond water while promoting fast fish recovery.





| Pet Type | Fish |
| Product Dimensions | 7 x 14 x 25 cm; 1.06 kg |
| Item model number | 2809 |
| Item Form | Liquid |
| Colour | Clear |
| Size | 1 l (Pack of 1) |
| Volume | 1000 |
| Number of Items | 1 |
| Quantity | 1 |
| Specific Uses | Treats fungal and bacterial outbreaks |
| Batteries required | No |
| Batteries Included | No |
| EU Energy Efficiency Label | A |
| Item Weight | 1.06 kg |
P**
Fish medication
Great product, it does what it says on the tin,
G**C
Hope it works
Bought this to help our pond goldfish.2 of them have ulcers, so hope this works and helps the fish :-)Well packaged, easy to use and instructions are clear.
S**N
Really worked
Really worked ! cleared the green water too
D**F
Saved my fish.
Id written off one of my fish but with 2x treatments of this, he seems OK. Visible signs and symptoms disappeared.
2**I
Worked on my poorly fish
I have a pond with various goldfish including a few black ones. One of the black ones developed white patches along the bottom and one of his fins looked shredded. I used the product as directed for 5 days (it does stain if you spill any and it’s a vivid green). The fish is looking much better and it’s a couple of weeks since I used it. His fin looks better and he is using it again. It had no detrimental effect on the plants or other fish.
M**N
Good for the price
2nd time buying. Isolate your fish and treat seperate because this stuff colours a lot. My filter was turned green and even my alfagrog and it never recovered. Good stuff if you follow instruction
M**R
Pond slug
Worked well
K**N
Works but you may have to do for longer than it days on bottle.
One of my female goldfish lost her scales due to ' harassment ' from other fish and got a fungus. This worked after using a 2nd time with a break of a week in-between. I was a bit concerned about the contradictory advice' not harmful to fish and plants' versus ' harmful to fish and plants' on the bottle but all fish and plants still alive and thriving.
Trustpilot
5 days ago
4 days ago