Hi Greg
This is one souce for Sodium Thiosulphate
http://stores.ebay.co.uk/Mistral-Cleani ... op=1&_vc=1 and another with the table on,just off to try and find it....
http://www.cnykoi.com/calculators/calcdechlor.asp ,I also have this from our group leader.
Regards Geoff
The thing with all this is; understanding how much chlorine is in your mains supply from your water authority. or alternatively over guestimating it based on the fact its ni-on impossible to over dose Sodium thiosulfate pentahydrate . Trouble with this approach is it gets very expensive , which is why there are cheap dechlor’s and there are expensive dechlor’s it all depends what they are allowing for in their mix
So what to do?
Water companies in this country are required by law only to put 0.5 PPM chlorine in their water supplies on a “”permanent”” basis, this will or should be a “maximum” permanent base line reading, it could be less at times. This does not mean this is the maximum you will get because they are also allowed to shock treat their supply systems periodically with 5.0 PPM chlorine to prevent bacteria and algae becoming resistant to the permanent base line, so the bottom line is most of the time you will be dealing with < 1 PPM but on occasion they will introduce 5.0 PPM so you will be dealing with > 1 PPM and up to 5 PPM and a short sharp shock to knock back resistance
I cannot speak for other makers, but when I did make dechlor ( I don’t now) all mine was calibrated to deal with 5PPM + chlorine, I suppose other makers only cater for the bare 1 PPM minimum but that’s for them to live with, but it would be prudent to allow for a the max, but as I say; this get expensive. So here are the figures, these are approx and not dead on but as near as you need to get feel free to round up or down to within 20 gm odd grams it wont make any difference its not gotta be down to rocket science calc's
All are in UK gallons
Roughly fractionally just under ½ of one ounce of sodium thiosulfate pentahydrate treats 1000 gallons of water for or containing 1ppm chlorine
All the following are stock solutions you can make up for varying chlorine concentration, with all the following tables are all to be used at 10ml to every 100 gallons of fresh water from the mains supply being put in the pond , ( you don’t need to dechlor the whole pond only what water is being replaced
160 gm sodium thio dissolved into 1000cc distilled water deals with 1 PPM chlorine
320 gm sodium thio dissolved into 1000cc distilled water deals with 2 PPM chlorine
480 gm sodium thio dissolved into 1000cc distilled water deals with 3 PPM chlorine
640 gm sodium thio dissolved into 1000cc distilled water deals with 4 PPM chlorine
800 gm sodium thio dissolved into 1000cc distilled water deals with 5 PPM chlorine
A litre of the above stock solution at 10 ml to every 100 gallons dose rate will dechlor 10,000 gallons at any of the respective above concentrations
To make a gallon/5 litre of stock solution, multiply any of the above by 5
Example to dechlor chlorine at 5PPM, 4000 gm sodium thio dissolved into 5 litre of distilled/demineralised or RO water. This will dechlor 50,000 UK gallons of water containing a concentration of 5PPM chlorine
Add dose prior to refill (don’t add it afterwards)
so by my reckoning to do the job right <belt and bracers for any contingency> at £6 for 500 gm’s it would cost £48 in S/T to make one gallon of the above = delivery cost of the S/T plus 5 litres of de-mineralised water , the colour you want it is your choice of food colouring
I stand corrected on this but, I think you can put the dose rate on this with out needing a licence as its not a “fish treatment” it’s a water conditioner and does not come under the new laws, the law applies to a treatment that medically treats a fish and/or can/ is capable of killing an organism by application an organism is classed as fish right down to through parasites to bacteria .
Duncan
