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Low Flow Toilets versus Dual Flush Toilets?

What’s behind the seat of your toilet? In general, more expensive does not mean better.


double flushing and clogging were widespread
Double flushing and clogging were widespread

When low-flow toilets were introduced in 1994, stories of double flushing and clogging were widespread. But 1.6 gpf ultra low-flow toilets have improved dramatically. The truth…most people have a standard 3.5 gallon toilet in their home labeled as a 1.6 and equipped with a early close flapper to meet that standard. Yes, that is why it will not flush well. The toilet was not designed to work on a half volume of water when it has to flush solid waste, liquid waste no problem. The second truth, most people end up buying a standard flapper when the original is repaired and have caused their labeled 1.6 toilet to use 3.5 gallons. You do not have to accept this as a standard operation, the solutions?

  • Buy a great plunger and keep paying high water bills. Cost $15.00, a big mess and no water savings L (3.5-7 gallons of water per flush)
  • Buy a new low flow toilet that is designed to operate under a low flow condition. Now called ultra-low-flush (ulft’s) Cost $100 up (1.6 gallons of water per flush)
  • Convert your current toilet over to a dual flush with a product like SelectAFlush, dual flush conversion kit. Cost $39.95 (1.1 to 2.5 gallons of water per flush average) *Note: A dual flush is rated in two ways: an average between the two flushes or a 4 to1 average. This is an average range we have seen:
    • Installed on a 1.6 gallon toilet, light flush capacities from .8 to 1.1 gallons and heavy flush capacities from 1.3 to 1.6 gallons per flush.
    • Installed on a 3.5 gallon toilet. Light flush capacities from 1.1 to 2 gallons and heavy flush capacities from 2.5 to 3.3 gallons per flush.
    • Installed on a 5 gallon toilet, light flush capacities from 2.2. To 3 gallons and heavy flush capacities from 3.8 to 4.5 gallons per flush.
    • Installed on a 7 gallon toilet ( maybe its time for an upgrade but if not) light flush capacities from 3 to 5.5 gallons and heavy flush capacities from 4 to 6.5 gallons per flush.
  • Buy a new Dual Flush toilet. Cost $300 up, light flush capacities from .8 to 1.1 gallons and heavy flush capacities from 1.3 to 1.6 gallons per flush.
  • Other options buy high-efficiency toilets (HET), Waterless or Pressurized toilets. I think all of this could be overkill and gives you an empty pocket for the initial purchase or is just too hard to maintain. Flush capacities from 1.1 to 1.28 gallons-down to zero…but you now have to use a shovel or chemical cartridges to get to the zero.
Confused yet?
Confused Yet?

If you are in the market for a low flow toilet you should take a look at a dual flush toilet retrofit kit for your old toilet. The conversion will save you water and money and keep your toilet from going to the dump, now that is green. And yes, you will not need a standby plunger….

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4 Responses to Low Flow Toilets versus Dual Flush Toilets?

  1. moreisles says:

    We are very happy with our SelectAFlush dual flush conversion kits We have wonderful Mansfield 35 and has never plugged but wow are we saving water now.. The rinse flush is taking tissue and changing the bowl water while the solids flush remains as it was designed. So much for low flow toilets on our budget. We would have had a low flow toilet investment, a plumber bill, and would have sent our old friend to the land fill. We say no, we want our solids flush performance and the option to save water during the rinse flush. SelectAFlush works like a charm, is fun to use, and our friends are lining up to add one (or two) to their homes.

  2. Admin says:

    I am glade the SelectAFlush is working so good for you. I do love Mansfield they make a great toilet. Keep Saving Toilet Water with dual flush. :)

  3. Pingback: California Residence Need to Save Water « Dual Flush by SelectAFlush

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