We manufacture Blue Diamond toilet fluid in the UK so I hope this info helps in relation to the original question.
We produce three different products:
Concentrate 2 Litre/ 1 Litre - this product has a 24% formeldahyde content. Most standard fluids have a 10% content so you can use half as much of Blue Diamond concentrate.
3 Litre Toilet Fluid - this product is a standard 10% formeldahyde product, so you use as much as other standard products.
Both of the above products cost around the same - £5.99-£6.99 ish.
The third, and final, product is Blue Diamond 2 litre/ 1 litre Green toilet fluid. This contains Biocide, rather than formeldahyde. This is better for the environment than formaldehyde but some septic tanks work in unison with formaldehyde so its best to check before you use a particular type. Due to quantities we produce Green is normally 50p dearer in stores.
I hope this helps in some way. For the best effect use Formaldehyde - and the stronger it is the more it will work (24% is the highest legal dose so is the strongest possible), and if effect isnt as important as the environment to you then green is best.
If you have any more questions please don't hesitate to ask.
Kind Regards,
Daniel at Blue Diamond
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Topic: aqua kem green and blue
) and she noticed that I was using aqua kem green, (smells very nice BTW!) She pointed out that not all sites let you use green/blue/whatever. 
Belinda
