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Old 02-08-2013, 01:43 AM   #6
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Originally Posted by holoublahee View Post
What does EI mean?
EI stands for Estimative Index.

It is a dosing regimen.

Giving your lighting (and assuming they are T5HO bulbs), you probably have enough plants and light to benefit from EI dosing.

For your CO2, are you using a drop checker (with a 4 dkH reference solution) to ensure that you are attaining levels around 30 ppm?

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