Microbial test for Purified Water

The latest BP method is by microbial filtration, utilizing a sample size of 100ml.
I find this method as not suitable compared to the older method of pour plate using 0.1 to 1.0ml sample.
Consider the fact that microbial limit for Purified Water is 100 cfu/ml. If you have 10 cfu/ml, a sample of 100ml will show you a result of 10 x 100 = 1000 cfu. Can you count this much cfu..? What if your sample is 20 cfu/ml, or more....?

Thus, a sample size of 1ml using pour plate method will neatly fit this situation. Most samples o Purified Water will be more than 10 cfu/ml and this will show well on the agar plate.

However, if you consistently achieved a level of less than or equal to 1 cfu/ml, then you should adopt the new method using microbial filtration and sample size of 100ml.

Anyone out here having problems with microbial test on Purified water that you can share..?
We'd like to hear form you!

AJ