sodium thiosulphate

[sam51]

hi guys just brought 1kilo of sodium thiosulphate, how do i make up a stock solution.
the st i brought is NA2S2O3.5H2O it came from http://www.mineral-water.co.uk.
the last branded named one i brought was 13% st. 87%water. which amounted to 130ml st 870ml of water.this made a litre of pond dechlorinator. should i make the same up. also dose a stock solution dematerialize
thanks sam.

[pepsi]

Hi ,I think that if you take 130grans of sodium theosulphate, and disolve that with a small amount of hot water (from the kettle), and the top this up until you have 1 litre of fluid. there you have it 130grams=1litre. This may be used at 10mls to 100 gallons changed. Hope this is helpful....and if it needs checking ,I'm sure Manke Sanke will advise...Barry

[Duncan]

its all relative to the amount of chlorine you have to neutralize, this will explain http://www.cnykoi.com/calculators/calcstdose.asp
worth making a note of this sites calculator remember that's in US gallons so compensate by 20%

dunc

[sam51]

its all relative to the amount of chlorine you have to neutralize, this will explain http://www.cnykoi.com/calculators/calcstdose.asp
worth making a note of this sites calculator remember that's in US gallons so compensate by 20%

dunc

hi duncan hope you are good.
dose the amount of chlorine matter,as off the shelf dechlorinator,come as what it is,
ie standard,the dose levels will be x mil for x gallons. how do the manufacturers know how much chlorine you have in your water.
or are there versions weaker doses,
can you over dose with sodium thiosulphate,

[Duncan]

first there is a legal limit for chlorine in domestic UK water supply < 0.5ppm. so in a way they do know what's in your mains so they make the dechlor up to deal with this plus a bit extra.

next, the over dose for S/T is way past what you can afford to use in your mixture <grin> trust me its way up there

last, remember when dechlorinating chloramines ( chlorine+ ammonia) you will be freeing up ammonia into your pond system best use a tiny bit of formaldehyde (1/10th normal dose) to neutralize any residual NH3

dunc