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Estimative index (from Aquatic Plant Central  http://www.aquaticplantcentral.com/forumapc/fertilizing/15225-estimative-index-dosing-guide.html  )

 

The Estimative Index (EI) coined by Tom Barr is a straightforward method for providing nutrients for a planted tank. The idea behind EI is simply introducing an excess amount of nutrients within an aquarium, throughout the week. This excess of nutrients floods the water column and feeds the plants. This is an estimative method; measuring specific nutrient uptake rates is not necessary and no test kits are involved. EI provides a surplus of nutrients that helps to prevents plant deficiencies, and allows plant growth to out compete algae growth. 

The process of which this is done is simple. Each day fertilizers are dosed, and the nutrients are absorbed by the plants. With this method being estimative, we can dose fertilizers according to general guidelines suited for our particular setup (see below). At the end of the week, one performs a 50% water change to ‘reset’ the nutrient load in the entire system. And then the entire dosing schedule is repeated. 

The primary fertilizers are the macro nutrients - Nitrogen (N), Phosphorous (P), Potassium (K), and the micro nutrients – trace elements (Plantex CSM+B, Flourish). Iron (Fe) can also be supplemented if necessary.

The Estimative Index method works best for a high light and well planted aquarium. However it is not limited to lower light setups, smaller quantities of fertilizers should be dosed in those instances.

 PPS-Pro system is easy to use and is the least expensive system in comparison to any other fertilizer. It is designed especially for aquascapers who want a system that is performing well, doesn’t need much testing and tweaking and also works with all lights and substrates, no water changes and large water changes. Entirely 100% planted aquariums with reasonable fish load.  PPS-Pro system is easy to use and is the least expensive system in comparison to any other fertilizer. It is designed especially for aquascapers who want a system that is performing well, doesn’t need much testing and tweaking and also works with all lights and substrates, no water changes and large water changes. Entirely 100% planted aquariums with reasonable fish load.  

A great write on the PPS method can be found here

 

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