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There are much bigger UPC available that you will not find in any best buy.
Although they will cost alot more.
The APC web site can custom configure a upc for you.
gas generator is good so long as your there to turn it on.
A UPC is peace of mind (at a price)
Battery powered anything is always...
Getting your skimmer working at optimum can take some time to setup.
More so in a new tank.
Google your model of skimmer and see what issues other people have had.
Good Luck
If your having a bad reaction I would suggest seeing your doctor. If really bad the emergency room.
Some people are affected worse than others.
always wear gloves !!!
I purchased a generic unit from ebay, 6 stage for about $70
It works very well and TDS reads 0. (so long as the water is stored in a container that is designed for water storage.