Most APC / UPS back ups of that type will only run equipment for a few hours due to a low amp hour battery. The difference with the ecotech units etc is they are strictly a 12v DC draw from the battery, while your UPS is going DC > AC > DC (pump transformer > Pump, and there is an "overhead" for that process to take place.
If you want to emulate the ecotech example, it's extremely simple to DIY with a 12/24v deep cycle battery and a float charger. There are numerous examples on other forums, just google "diy ecotech battery backup". The only thing special about the Ecotech release is the mark up they're able to charge for a couple SLA batteries and a float charger.
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