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Ultra Low Flush Toilet (ULFT) Replacement Program. Paula Mohadjer Conservation Programs Coordinator Jordan Valley Water Conservancy District. ULFT Pilot Study – 2002/3. Replace 275 existing high-volume toilets in the District’s service area with ULFTs and determine water savings by:

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ultra low flush toilet ulft replacement program

Ultra Low Flush Toilet (ULFT) Replacement Program

Paula Mohadjer

Conservation Programs Coordinator

Jordan Valley Water

Conservancy District

ulft pilot study 2002 3

ULFT Pilot Study – 2002/3

Replace 275 existing high-volume toilets in the District’s service area with ULFTs and determine water savings by:

Measuring the water use (gpf) of the old toilet

Measuring the water use (gpf) of the new ULFT

Monitoring the number of flushes on 15% of the new ULFTs

Conducting a follow-up survey

Comparing indoor water use records before & after installation

Determining cost-effectiveness of the program

ulft installation

ULFT Installation

203 Participants

131 received one ULFT

72 received two ULFTs

Participants selected their ULFTs from three models:

Caroma Dual Flush: 22% (61)

Niagaras Flapperless: 44% (120)

Gerber Aquasaver: 34% (94)

caroma dual flush

Two buttons: one for large volume flush (LVF - 1.6 g) and one for small volume flush (SVF - 0.8 g)

Caroma Dual Flush

Estimated 80% of flushes are small volume flush, so high potential for savings

Water use of dual-flush in other studies:

Toronto: 42% less than old toilet

Oregon: 67% less than old toilet

Seattle: 24% less than new 1.6 ULFT

Ontario: 29% less than new 1.6 ULFT

niagara flapperless

Niagara Flapperless

Unique flushing mechanism: bucket tips water rather than a traditional flapper

Most common cause of toilet leakage is deteriorating flappers

Replacing toilets in Ontario study saved 25% due to leaks alone -- the new ULFT saved 17%

Flappers have 5 year life and generic flappers don’t work well – 85% bring flush volume up to 2.9 gpf

follow up telephone survey

Follow-Up Telephone Survey

A customer satisfaction telephone survey was completed with 92% of the participants

People per household: 2.96 (range of 1 to 10), 28% changed household size from beginning of study, but average stayed the same

Toilets per household: 2.7 (range of 1 to 6)

83% of the new ULFTs installed in bedroom bathrooms, 11% in basement and 6% other such as laundry bathroom

survey overall toilet performance

Survey – Overall Toilet Performance

Overall performance rating of the toilets on a scale of 1 to 10, with 10 being excellent.

-Caroma: 8.9

-Niagara: 8.8

-Gerber: 7.8

Would the participant recommend this toilet to others?

survey double flushing

Survey – Double-Flushing

How often does the new toilet have to be double-flushed?

survey clogging or plugging

Survey – Clogging or Plugging

How often does the new toilet clog or plug up?

metered water use all ulfts

Metered Water Use (all ULFTs)

Water use was metered on 94% of the old toilets (6% broken or leaking badly):

Average water use of old toilet: 4.16 gpf

Range of old toilet water use: 2.1 to 6.7 gpf

65% of old toilets used over 4 gpf

Water use was metered on all new ULFTs:

Caroma: 1.68 and 0.88 gpf (1.20 gpf)

Niagara: 1.69 gpf

Gerber: 1.80 gpf

flush counter data ave of 42 ulfts with counters

Flush Counter Data - Ave of 42 ULFTs with counters

15% of the ULFTs had counting devices for 50 days:

13 Caromas, 14 Gerbers, 15 Niagaras

Average water use of old toilet: 4.03 gpf

Average water use of new ULFT: 1.56 gpf

Water saved per toilet: 2.47 gpf

Average number of flushes per day: 8.9 fphd

Water saved per toilet per day: 22.7 gphd

Water saved per toilet per year: 8,286 gphy

cost effectiveness
Cost Effectiveness
  • Average cost of $200 per ULFT
  • Annual Cost: $313 per AF in comparison to future water developments of $400 to $650 per AF
  • - 20 year life of the new ULFT
      • Water savings of 42 gallons per day
      • 4% interest per year
  • Without installation/monitoring equipment:
  • Average cost per ULFT is only $97, which would drop annual cost by more than half
where next

Where next?

JVWCD just completed another ULFT replacement program: modified voucher – possible expansion to Member Agencies in 2004

Applications and vouchers mailed to residential customers who picked up their free toilet/s

602 participants: 1045 Niagara Flapperless ULFTs

Program cost: $120,000, or $113 per ULFT

Assuming 42 gallons saved per ULFT per day: annual savings of 50 AF attributed to this program

Billing data comparisons available April 2004

Reports of both programs available on website: www.slowtheflow.org