• Fast acting gel formula• Start new aquarium filters - for fast introduction of fish• Treats aquariums up to 2,500 litres How To Use PURE+ Aquarium Filter Start Gel:• Shake well before use to ensure the bacteria has not settled.• Unscrew the cap and pour the contents of the bottle directly onto your filter media.• Pour enough gel to fully coat the media up to a maximum of 125ml on the first application.• Repeat the dose after 14 days until the bottle is empty.• You cannot overdose your filter with gel.• We always advise the addition of oxygen to your aquarium via an air pump and diffuser when using PURE+ Aquarium Filter Start Gel.• Always perform regular water tests using a suitable test kit, especially before adding fish to your aquarium.• If a UV-C is running, switch it off when dosing and keep switched off for 12 hours after dosing.PURE+ Aquarium Filter Start Gel will not address problems with green water, a suitable UV-C should be used to clear green water. Product Information:• PURE Aquarium Waste Remover is safe for use in all freshwater aquariums.• We would always recommend the addition of oxygen into your tank using an air pump or venturi.• Because PURE Aquarium Waste Remover is a natural product it is perfectly normal that the balls may vary in size.• PURE Aquarium Waster Remover can act differently dependent on water conditions in each tank. This means that variations in appearance are normal and the rate of change can vary.• Each PURE Aquarium Waste Remover ball is manufactured from a natural polymer and is biodegradable.• Wash hands after use.• Once opened, store with lid tightly closed in a cool dark place.• Keep in a safe place out of the reach of children.