Perlite

Perlite Grade	Bag Weight (2.8 cubic foot bags)	Relative Porosity
Harborlite 200	35	350
Harborlite 400	33	550
Harborlite 500	40	-
Harborlite 600	38	-
Harborlite 635	35	850
Harborlite 700	30	1000
Harborlite 800	27	1175
Harborlite 900	25	1350
Harborlite 1500	23	1550
Harborlite 1800	22	1700
Harborlite 1900	22	1900
Harborlite 2000	16	-
Harborlite 2100S	16	-

These are typical or estimated physical properties, not specifications and thus should be used for comparison purposes.

Four cubic foot bags are also available for all Harborlite grades. Harborlite grades with a narrower particle size distribution are also available in the following grades. 700S, 800S, 900S, 1500S, 1800S, 1900S and 2000S.

Harborlite, Perlite filteraids are excellent filteraids, however they cannot always efficiently remove the same turbidity as equivalent Celite, diatomaceous earth (diatomite) filter aids because of the difference in the shape of the actual particles. Celite, diatomite offers a more tortuous path to the flow of the fluids because the Celite particles are intricate, complex shapes compared to Perlite.

Celite, diatomaceous earth (diatomite) magnified 1000X.