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https://www.swelluk.com:443/swell-black-lava-gravel-rough/ 
Swell Black Lava Gravel Rough
100% natural gravel that can be used in any aquarium type.
Products
Product Information
Professional quality natural black gravel aquarium substrate, sustainably sourced and 100% natural. Suitable for use in all types of aquariums where a dark coloured substrate in a through-graded range of sizes is desired.
Smooth rounded particle shape, together with in excess of 96% basalt and granite materials makes this mixed size gravel an ideal product for Marine Aquariums, Tropical and Coldwater setups alike. The unique through-grading of our Beach 49 Rough Gravel provides for a natural look, and with a signature lighter coloured granite fleck demonstrating that this is not an artificial gravel that has been coloured black.
Key Features:
- Come pre-washed, graded and kiln dried
- Mixture of 3mm -10mm sized stones
- Non artificial, naturally coloured