The Planted Tank Forum - View Single Post - ADA Ferts vs Pfertz vs Dry Ferts
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post #6 of (permalink) Old 11-26-2012, 02:35 AM
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
The 50% water changes called for in the EI method are not because dry fertilizers are used, but because dosages are intentionally a bit higher than the plants will use, allowing the concentration to build up in the water over time. Whether you use Pfertz, ADA fertilizers, GLA fertilizer chemicals, or Flourish products, you still need the water changes if you dose enough to make sure the plants' growth rates are not reduced by a lack of a nutrient.

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