01-08-2007, 01:56 PM
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EI is the Estmiative index, basically dosing enough to make sure there is always and abundance of nutrients and never a lack of them.
PPA is Actually PPS, sorry, it is basically a way that has been developed that you test, test, test and retest your tank in order to determine exactly how much you need to dose for your plants. I dose EI because I don't like to test but once a week and if there is a problem.
Other methods are to get nutrient rich substrate and only dose the substrate so nutrients can leech out into the water column. Some say that this eliminates the need for dosing at all except to add a root tab, which in most cases are home made for cost. Another methods is to test once a week, before the water change and after the water change, 50% change is needed or as close as posible because this uses averages to establish plant uptake and dosing needs.
I use EI, simple, effective, easy and my plants thrive. I also dose Excel now because I don't like the instability of DIY CO2 and it caused really bad BBA algae in my tanks.