Increase and stabilise ph and kh.

-Natural osyter will slowly dissolve and release carbonates and calcium ions into the water.

-It increase and stabilise the PH and KH over 6 months and prevent dangerous ph crash or swing in aquarium/pond.

-The oyster shells are thoroughly wash and further cleaned to remove any leftover organic residues.

-Suitable for canister filters, internal filters, top filters, trickle filters, pond filtration and sump filtration.

-2.5kg bag for 1000-2000L

-0.8kg bag for 300-500L