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OK, that makes more sense. Simon

I didn't use the zerowater, I just took a reading from water of our drinking machines, it contains a RO, and also taken the reading from a tap, in both case, the water was in a ordinary ceramic cup.

I agree it should last a long time. Don't forget to mash up the 5 in 1 with a hammer BEFORE opening the packets as it is much easier and cleaner to do it that way than trying to do it once the packets are opened! If the 2 snowflake bottles are only about half full I would put both those in the one tub and use the other tub to empty the 5 in 1 into and mix/store it in it! The mineral fluid double is super easy to use but needs a thorough shaking each time you use it to get a consistent reading. Simon

It would still have been a bargain at the full price, so you did really well. The length that the filter lasts will depend on the TDS of your water but I think yours is a lot less than ours is in the UK. My TDS 170 does about 100L so if your TDS is half ours then it should do 200L? I'm impressed the stuff from UK has arrived already! It may be worth considering that for future stuff? Simon

Just to let you know, I have received both package today, I also noticed that zerowater 20 cup I purchased was priced wrong, I got it for GBP 19 with coupon GBP 5 discount, making it GBP14, apparently the price with up the next day from GBP 19 to GBP 26.99.