I live in Canada and I haven't been able to find a Polyquat product called hth.

I understand that it is a liquid algicide and that it is recommended as a product to help prevent algicide from forming in your pool.

This product contains:
60%
poly oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride according to Ben's page:
http://www.poolsolutions.com/gd/polyquat.html

There are a number of liquid algicide for sale in my area. I have been able to find these products... would you recommend one over the other.

Bioguard's Algae ERASE
3.3% Elemental Copper with polcarboxylate and polyhydroxy acid stabilizers

OR

Poolcare SUPER Algae Kill 40%
poly oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride
This has the same elements as the polyquat Ben recommends but only at 40% strength.

Which product would be better to use, and at 40% is it strong enought to do the job.


Thanks for any help you can provide.
Dave