[koibooi]

Quote: Originally Posted by schildkoi UVs address the die off rate but do nothing to reduce the replication rate. Keep in mind, a filter with "2X" surface space/efficiency can be no more effective than one with "X" if "X" is already efficiently processing the all nutrients being supplied. Thus, the turn over rate (or amount of nutrients being fed through frequency of such) is typically the "forgotten factor." by increasing the filtration AND improving the turnover rate, the ambient nutrient level is reduced which in turn lowers the replication rate of the unicellular algae. This not only helps to improve clarity, it has the even better result of improving the QUALITY of the water.

Logic tells me that if the UV's cause a die off rate that is faster than the replication rate then I will also get clear water. Also, if a filter has e.g. 400 square foot of media (2X) it will be more efficient than a filter with 200 square foot of media (X) even if the latter is turned over twice during the same time.

In my instance the 30 ton pond is turned every 40 minutes. I would hate so see the current, pumps and electricity bill if I had to push that up to turning the 30 tons every 20 minutes.