Skimmers will still skim during Ionic Imbalance.
For those unaware, Weipro although a cheap skimmer have been proven to skim pretty well for an entry level skimmer.
The technology behind Weipro is very simple - venturi. Venturi is basically a simple device that mixes water with air and thus creates bubble.
Why some reefers decides to use other skimmer are:
1) Wanted finer bubbles thus went for Becketts or Needlewheel
2) Attracted by other cheaper skimmer that promises more such as Macro
3) Follow the crowd - monkey see, monkey do
Thus if you tune your Weipro correctly it will definitely gives you the skimate worth what you have paid for.
If you still have faith in this skimmer read Here. And if you still have problem tuning, PM me.