Know Your Toilet



Wondering if Drop-A-Brick will work in your toilet? If you have a 1.6 gallon toilet or larger, then yes! Drop-A-Brick will likely increase your toilet’s performance. If you have a new, high efficiency model with a tank volume of 1.2 gallons – then Drop-A-Brick will displace too much water and you won’t get a proper flush. 

To determine your toilet’s volume, look for marks or labels near the toilet seat hinge. A 5-gallon per flush (gpf) toilet might be shown as 22.73 liters, a 3.5 gpf as 15.91 liters. All 1.6 gpf (6.1 liters) toilets should be marked at this location. If no markings, check the underside of the tank lid or the tank’s back inside wall for a date stamped in the porcelain.

Click on the icons above to learn more about what kind of toilet you have, and if you should Drop-A-Brick in it.

Old Toilets

Toilets manufactured before 1980 use between 5 and 7 gallons per flush. Sometimes more. Toilets from the early 1980s to 1992 typically use 3.5 gallons per flush.

Average Home Use 26,000 + gallons / year old x 1000

Ultra Low Flush Toilets (ULF)

Toilets manufactured in 1994 and beyond are typically Ultra Low Flush toilets.
An ULF toilet uses 1.6 gallons per flush..

Average Home Use 11,000 + gallons / year ulf x 1000

Hight Efficiency Toilets (HET)

The crowned jewel of the toilet world use 1.28 gallons per flush.  Most HET toilets were manufactured after 2002. We don’t recommend using Drop-A-Brick in these toilets because your flush won’t get the job done properly.

Average Home Use 9,000 + gallons / year hef x 1000

Dual-Flush Toilets

Dual-Flush toilets are a type of HET with a full flush and a half flush capability. The average flush volume of a modern dual flush toilet is 1.1 gallons or less. If you have one of these, congratulations! You’re way ahead in the game of water conservation. Want to do more?

Average Home Use 8,000 + gallons / year dual x 1000