Here are a couple of quotes from users of Biomagic Toilet treatment as well as our world famous Tank Cleaner.

Hi Alex
I just wanted to give you an update….

Wow! The foul stink has almost completely gone. Can’t thank you enough for your prompt reply and support with our problem. I can highly recommend the Biomagic green liquid and it’s so good to know that it’s not crippling the environment like the blue stuff!
We will continue to use the liquid and spray and will tell our fellow canal chums about your fantastic products.
Thanks again


Sent via BT Email App

Here are a couple of true accounts from people who used BioMagic Tank Cleaner after filling water tanks with fuel in error!

“I recently bought this product to clean out a camper van water tank that had been accidentally filled with diesel. I can admit it now, as it seems I’m not the only one!

I wasn’t confident that the tank would ever really be the same again. I searched the net and found a camper van forum discussion (2009) where a person had made exactly the same blunder and having tried a few things, found that Bio Magic was the only thing that worked.

I followed the procedure using your product and the results are quite amazing. This water is fully potable – I cannot detect any odour or taste and I have drunk half a litre with no ill effects.

I am particularly impressed that this product is safe and fully bio-degradable.Also, I’ve saved hundreds of pounds quoted for replacing the system!

Many thanks, Biomagicuk”


This is from a customer in Southampton, who inadvertently put diesel fuel in his fresh water tank on a luxury charter yacht. This is his story.

Diesel in your Water Tank? Need a ‘Magic’, easy and relatively quick remedy?

A confession! “Did I just do that?” 5 gallons of red diesel straight into one of the three fresh water tanks. “I can’t believe I just did that!”

After 40 years of avoiding this error, at last I had joined this elite and secretive club. Who would wish to admit to this ‘crime’? I had no choice as my other half observed me who was running the hot water at the time. So crime 2 – she, I mean I, allowed the red diesel to enter into the calorifier circuit, producing a lovely rainbow pattern in the sink. Joking about it was my only recourse, as jumping off the Itchen Bridge seemed the only other option that would placate those around me.

Now what? Straight onto the web – what had others done to rectify this error? Well the most common answer was – avoid doing it! Far better to have put water into the diesel tank than vice-versa. From practical experience we would agree with that sentiment. The second piece of advice was – “Isolate the water circulation system immediately – don’t use it!” I had failed on that count as well!

The most favoured solution offered was to replace all the affected water circuits with new pipes, tanks, pumps and calorifier as well. This seemed extreme, very costly particularly in the time required to do the job. Fortunately the boat was not needed for 6 days so I at least had time on my side.

We started by taking the inspection hatch off the affected stainless steel water tank. Yes there was the diesel and its characteristic smell but no water! We had hoped to find the diesel floating on the top of the water – effectively isolating it from the water system but no, the tank had been nearly empty and that is why we had hot water seriously contaminated with red diesel. We drained the tank, extracted it from its foam retaining structure and took it back to our workshop to transport it to the tank cleaners, who seemed less than certain that they could remedy the ‘diesel smell’ issue. Retired for the day to ‘sleep on the problem’.

Next day dawned early, as I found sleep difficult – so onto the web again to see if any better ideas were available. Well others had used agitated ‘Fairy Liquid’ to remove the diesel from tanks, with a variety of solutions to remove the residual Fairy Liquid and any remaining diesel smells. So we tried that on our tank – hot water flushing and quite a lot of Fairy Liquid, followed by several hot water only flushes, then cold water only flushes, ending up with 16 Milton tablets standing in cold water overnight. It worked!

Those on the web were far less confident that such remedial action would work for plastic tanks and pipes. I tried using the technique on the affected hot water system, using the calorifier to heat the water and re-circulating it through the system using the affected water pressure pump. Several attempts were made but one could always detect a trace of diesel, particularly the first flush from the calorifier. I guess the heat brought the diesel off the walls of the calorifier, which then floated to the top to become the initial burst of hot water / diesel mix.


Tucked away in one blog, was reference to ‘BioMagic’, with claims that it had been used successfully to eliminate diesel and it’s smell from fresh water systems – mainly in caravans. It claimed it was not necessary to remove tanks or plastic piping – too good to be true?

I looked it up on the web; Dairymax-uk.co.uk and then phoned Alex on 01530 249253. He listened to my problem and confirmed that BioMagic should solve it for me but to follow the instructions carefully, particularly the inclusion of methylated spirits in the flushing process. He reported success on many caravan-based systems and on one yacht.

We ordered some, re-installed the tank with new input and output plastic tubes, and flushed the whole hot water system through as per instructions, then put in the BioMagic leaving it for 24 hours to ‘do its thing’. We then flushed the whole system through again and there was no sign of diesel in either the cold water system, or the hot water system. Bio Magic had worked!

Talking around the Marina, another person had the same problem but with plastic tanks. We advised he try BioMagic, which he did. He did not dismantle any of the system. First try left some traces of diesel but following the second treatment all traces of diesel had gone.

So BioMagic worked for us, is not that expensive and certainly will save a lot of time and expense in not having to dismantle the water system and substitute new parts.

Eddie Hill

Firstaway Charters
Ocean Quay Marina
07798 730044