Perfect prep machine question

[KatyN]

I read the instructions through the other day and it says to put the water in first and then the formula.. Is there any reason for this!? I was wondering if I could fill the bottles with formula before I go to bed and then top up with water as required!
Thanks kx

[FuzzyOwl]

In my experience powder will go rock hard quite quickly if you take it out of the box and store it in the bottle. You could always store the powder in a special dispenser to use when needed. Or you can take your Perfect Prep machine upstairs with you at night to use.

[KittyCatKittyCat]

I think it's because it doesn't mix well, and it can spray the powder about (back onto the machine) thus making it less sterile.
So - not mixing well can lead to lumps, which won't be sterile throughout.
Back-splash of soggy powder clumps end up sitting on the machine, and can breed bacteria.
I think - I'm not a scientist!

[KittyCatKittyCat]

As owl suggested, we use the PP machine over night, but make it fresh with the kettle/tap in the kitchen during the day.