Terry Love Redmond WA Save time, and money. Find out which toilets work in todays world. The toilets in this report have been proven by plumbers to work! Yes, they work just fine in spite of the current standards which allow for a maximum water usage of 1.6 gallons per flush(GPF).A report on low flow toilets, the ones that work! Below are my recommendations for toilets that work in todays world. find out which gravity, flushmate assisted, pf/2, whispervac, g-max toilets that work. new and updated reports from the plumbing field.