Product review (3 stars): So, so...
I put the amount that was directed on the bottle but it tends to suds up a bit.  I also think it has messed with the filters in my new portable evaporative cooler.  When I first turn it on and start the water, it spits droplets out.  This did not happen at first, it has occurred over the following few days use.  I believe this sudsy gunk has built up in those filters.  But, I will have to take it apart to see.

I think I will cut back and then when I run out, or probably sooner, I will just use a vinegar solution.  I may have to use that to clean the filters.  And, vinegar is great for keeping lime scale and alkali deposits down.