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Home-grown phyto will have some dissolved nutrients (ie. phosphate and nitrate) in the water. They will not be removed by skimming. The only ways to get rid of the excess nutrients are:
1. Let the culture grow until it depletes all the nutrients. This is a fine balance however as the phyto then quickly loses nutritional value.
2. Concentrate the culture by removing excess water and dissolved nutrients (eg. as by centrifuging). DT's uses some method to do this so as to minimize the excess nutrients present.
Many people use home-grown phyto. You just have to be careful not to overdose it.
Allen
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"Never underestimate the power of the Schwartz." Mel Brooks
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