OK, figured it out, if a 1 lb coffee can 4" dia x 5.5" long holds 1/2 lb, how much does the bigger 33 oz plastic jug hold? the math was simple, works out to 1.1 lb or something. Silly me, never mind. Thanks all.

By the way, our first pool had a DE filter and it worked great except for once when a cracked manifold was letting DE into the pool, so DE is all I have ever known. I bought a new Hayward 48 sf Progrid last year and love it. Backwashing is much simplified