I was in WalMart recently and came across the Duration tabs. Just as Carl said, they were only 46% (or 48) chlorine not the 68% so I didn't bother with them. This weekend I stopped in a pool store that carries HTH products and their Duration tabs were 68% with the plastic case around them. I also found an on-line vendor that sells the Poolife version (same parent company - Arch chemicals) that also looks like the 68% version (I googled Poolife Active Cleaning Capsules).

I wonder if the 46% versions are a "special version" of the product that sell for less $$. I've heard about this happening with the big box stores - they want a lower price and the manufacturer meets that price by cutting corners. I didn't notice what WalMart was selling theirs for so I can't compare but a 6 capsule pack at the pool store was 10.99 and they had a bigger bucket (25 lb?) for 59.99.

Anyway, I picked up a few to use mainly when I go away - I figure I can put one in the skimmer before I leave and ask a neighbor to put another one in later in the week.

Peter