Polyquat or not? "Ammonium Chloride in solution"

[a34536]

I'm in the process of closing the pool, and bought this to add after shocking.

http://www.swimmingpoolchemicals.co.uk/ ... cts_id=848

The MSDS is here
http://www.swimmingpoolchemicals.co.uk/ ... aecide.pdf

Just realised it is not Poly[oxyethylene(dimethyliminio)ethylene(dimethylimino)ethylene dichloride].

Polyquat doesn't appear to be widely available in the UK. I have a tensioned mesh winter cover over the pool. Should I bother with an algaecide, or return it to the shop?
Thanks!

 

[a34536]

Anyone with a view on whether to put this in the pool? Thanks!

 

[Bama Rambler]

I'd return it. If you've closed the pool per instructions found here you won't need it.