They are the same. Usually it's granular chlorine, but some 'slow' tabs are also cal- hypo, as opposed to trichlor - they aren't as long lasting as the trichlor, but at least they don't add to cya. If you're thinking of using some in your liner pool (the granular) you want to premix it in a bucket of water, stir it and let it dissolve for a few minutes - then slowly pour it in front of the return until you see the undissolved stuff start to enter the water - then stop pouring and refill the bucket, stir and let sit a few minutes - at this point all the 'solid' stuff that you may see as you pour it in will only be the 'ash' (binders) and it's OK to let that into the pool. The reason for the predissolving is because any of the solid stuff that still has chlorine in it that settles on the floor can bleach out and weaken the liner.
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