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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Gravel has no expiration date, unless the manufacturer specifically states this. It is the quality of water that determines what should be done with the substrate in a system. As long as you rinse it thoroughly during water changes and it doesn't appear dirty, it can continue to be used.
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