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Another thing with a few of the mentioned brands the shelf life is a maximum of 3 months if the drum is not opened, normal hypo is a minimum of 6 months , with the lightning clenze and pure seal I had drums after 8 weeks that expanded and started leaking causing all kinds of issues both companies denied that this happens I have had it several times , I think it starts to decompose causing a gas this is another reason to not use them as they can leak in the van , garage or at the customers propertyHere's a link for the type of hypo you want - although this 15% strength and you need to bear in mind it is available in different concentrations. But 10%, 15% it all does the job and just adjust the dilution accordingly. Now you know what to look for you might be able to find it locally at cheaper price. This particu;ar link is to Liquipak on Amazon and I've bought from them a number of times and delivery is fast and reliable (and used to be free!).
This is Benz Lightning Cleanze that @Pjj mentions. Just for your info if you did want to use it then buy it direct from Benz - I recently saw a company on Ebay selling 20 litres for £129.99 which is daylight robbery. It's pricey enough already but nowhere near that much. But that's fair enough because it is an approved product which obviously comes at a cost.
I also just want to clarify an earlier comment about biocide and the rain soaks it in?! No. You want it to soak in before it rains and if it rained hard enough too soon after spraying it you could end up needing to do it again. Apply on a dry day.