It's one type of linear quat and we don't recommend those (even though they are less expensive) because they can foam and generally break down faster from chlorine so increase chlorine demand noticeably. Also, if you properly maintain the FC/CYA level in the pool, you don't need an algaecide. I presume you are only asking for using it for closing, but even so, it's faster reaction with chlorine means it is less likely to last through the winter compared to Polyquat.