37% Formaldehyde

[EireAndy]

Hi all,

I need to treat for whitespot in my QT (1000l/220g tank) 16-18*C, all other parameters in check.

I have a bottle of Kusuri Malachite Green and today I acquired a litre of 37% Formaldehyde (Formalin)

So my question is how much Formalin do I need to add to the MG for treatment?

Thanks in advance,

Andy

[greg]

Andy,

Have a read of this - dosage rates etc are in there.

http://www.koiquest.co.uk/whitespot.htm

[EireAndy]

Hi Greg,

Thanks for the link.

My issue is the dose rates are for 30% formalin and I have 37% Formaldehyde so I wanted to be sure so not to overdose.

Cheers,
Andy

[greg]

Personally I have never had an issue using these dose rates for 35/37% formalin in the past.

Can I guarantee you wont? - NO - but just my experience says to use those dose rates in my pond is OK. I guess you could always minus 7% from the volume you need to use to treat but most treatments have a "safety factor" built in to people proof them.

[EireAndy]

Thanks Greg,

I will go with that so and we'll see how I get on!

Cheers,
Andy

[Manky Sanke]

Greg, Andy,

A bit of maths pedantry for you.

A 37% solution is 23% stronger than a 30% solution. (Or looking at it in terms of reducing a dosage; 30% is 19% weaker than 37%)

If you ignored the built in safety factor and wanted to get exactly the same strength in the pond using a 37% solution instead of 30%, you would have to reduce the dose rate by 19%.

[EireAndy]

Thanks Syd,

I better get the calculator out.........

With treating 220 gallons it won't need an awful lot!

Cheers,
Andy

[Duncan]

Andy

because of the way formaldehyde behaves in water its gone in around 12 hours max if there is a high organic load it will not even last half that, so it makes little difference dose 37% at 10 ml to 176 gallons the exact same as 30% you just get a bigger bang (albeit momentarily) for your money, its not a life threatening dose, nowhere near.

[EireAndy]

Thanks for the advice Duncan, always good to know one is not going to cook the koi in a vat of chemicals!

At temps between 16-18*C is it okay to treat every three days for whitespot with an FMG mix?

And if so should a partial water change be carried out before each new dose?

Sorry for all the questions, never stop learning!

Cheers,
Andy

[greg]

Andy,

at 16-18deg C i would be leaving 5 CLEAR days between doses. Then a 15% water change before re-treating.

[Duncan]

Andy,

at 16-18deg C i would be leaving 5 CLEAR days between doses. Then a 15% water change before re-treating.

Ditto

dunc

[EireAndy]

Thanks guys!

White spot now in the main pond too, this endless Spring/Summer carry on is killing me

So is the price of treatments, if only postage to Ireland was free

Thanks again, very much appreciated,

Andy