10x flow rates through sump..
Due to the large flow rate through the sump to the tank the water flowing through the overflow box creates it's own surface flow towards the overflow box, this is likely the original reason for such high return rates The issue with this method is that when only 2 or 3 x rates are required using 10x or greater pulls more than just the surfactants
from the tank but also a large percentage of non contaminated water which changes the surfactants properties from a concentrated to a diluted solution.
It causes drain issues which if understood could easily be resolved, it enhances micro bubbles in the sump, requires the need for a more expensive pump with high running costs.
Most if not all skimmer manufactures suggest it makes the skimmer less effective.
low flow rates through sump ie from 1x to 3x..
Providing flow is configured correctly the low flow rate will remove surfactants in concentrated form, it will make the skimmer more effective, reduce the need for large overflow systems,reduce the cost of the return pump, reduce the operating costs of the return pump, eliminate micro bubbles, reduce noise and heat.
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