I want to thank everyone who provided recommendations, advice, and information.

But I have one question remaining -- will I need to increase the duration of my pool filtering times? I realize the answer depends to some degree on the 'chlorine demand' of my pool.

I have a 30,000 gallon, vinyl liner, in-ground pool. Since switching from bacquacil to chlorine, I run my filter in 2 shifts, each 4 hours long.

In looking at on-line sellers for products like Aqua-Rite, I see one who has apparent manufacturer's literature that states "no change in filtering times or duration". Yet, when I go to the Goldine/Aqua-Rite website, I see no such claim. That leads me to believe that this is an old marketing claim that proved to be wrong over the last few years, but the seller is still using the old marketing info.

Sorry if I seem paranoid, I just don't want to drop several hundred dollars onto a convenience product and find out that that my filtering times will go way up.

Any additional insights on this?

Thanks!