Is Polypropylene a Safe Plastic for ATO Reservoir?

[AWiseOne]

I have a smaller polypropylene bucket bucket I was planning on using to hold the water for my ATO. Will that be safe to store the water in? I've read that HDPE is safe, but I can't seem to find the right size container that will work in my aquarium cabinet.

[jservedio]

Yes, totally fine. Just make sure it's super clean before using it the first time.

[DaJMasta]

Yes.  Generally any food safe plastic vessel will be suitable, but you want to avoid metal fittings of any kind - maybe not as critical for RODI storage, but a good rule for stuff being used in marine systems.