The Planted Tank Forum - View Single Post - What's the best sand substrate for plant growth?
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Old 08-03-2009, 08:04 PM   #9
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Originally Posted by i'm a ninja View Post
Sorry, this is probably a dumb question, what does "CEC" mean?
To expand on Cation Exchange Capacity. It's basically how effective the substrate is at adsorbing positively charged nutrients, hence it serves as a nutrient storage. Sand has a low CEC, substrate like Flourite have a high CEC.
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