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Doesn't matter. Distilled or deionized, will get worse as soon as it touches your loop. Just use one of those waters, with no additives, and only with a silver coil to kill little bugs.
If your system gets overrun with bacteria or algae in less than a week you have a serious problem(IE its pretty unlikely). I wouldn't stress on the situation just add your biocide ASAP.
I did see it happen here where the OP waits 2 weeks? or so. Became a mess, the uglies had already started to grow.
DI is easy to get in the USA and many other countries. Very common in Hudifiers for babies etc.
For some reason it's not readily availible in the UK. Best bet is find what folks use in humidfiers.
The reason we and the humidifiers use it is all the hard minerals have been removed that can cause build up. Like a old dripping faucet has that 'scale' on it where the water drips. Just like a cave and a stalagmite.
That's pretty much the only reason. When I first began C years ago, I even went to the point of boiling the water and letting it cool. I don't do that anymore. But I do have a glass measuring cup, I put in the microwave and boil water in it to sterilize it before using it it to fill my loop.
As soon as the loop is kinda bumped and bled, I right away add my biocide, or already have the killcoil (silver) in the loop of course.
I being old school use PHN Nuke and killcoils. Never had an ussue, ever. Deadwater is the same BTW.