NEW Silver Solution water tests
collected 500 ml of raw (Provo River water) sample and
inoculated the sample with 2 loops (3mm) of Klebsiella
oxtyoca. Using the membrane filter technique for total
coliform, five 100 ml of aliquots of the sample were
1 was spiked with a .10 mg/l concentration of silver
solution. Number 2 was spiked with a .20 mg/l concentration
of silver solution. Numbers 3 and 4 were each spiked
with a .50 mg/l concentration of silver solution. A
positive control of 100 ml was used without silver addition.
1.5 minute contact time was allowed on sample 1 before
filtering. A 2 minute contact time was used on sample
2. A 10 minute contact time was used for samples 3 and
filters were incubated at 35° C for 24 hours.
The positive control = 705 cfu/100 ml. Samples 1 thru
4 contained 0 cfu/100 ml.
FROM: Gerard Yates
The NEW Silver Solution effectively killed all colony
forming units (bacteria) in a spiked raw river water
sample containing a 0.10 ppm concentration of NEW Silver
Solution in 1.5 minutes of contact.
The NEW Silver Solution was not removed from the water
sample prior to filtration. Therefore The NEW Silver
Solution residual on the membrane filter may have inhibited
growth during incubation.