Compare to marine pure blocks i use for years and stil have 2 blocks and 4-5 plates in my system this is smal they are justVery tiny blocks? The box says the treat up to 750 Gallons,
What are the dims on these?
4 x 4 x 1 inch
but hopefully they are good i put this two into sump and time will tell but its no way near the porosity of marine pure but the material is hard like rock and not the soft material as marine pure
have a great easter!