Washing RO-DI reservoir

[360º]

for the last 6 months ive used a reservoir to hold RO-DI water and to mix saltwater. and everytime i mix salt, some white stuff stays on the bottom

im just wondering if i wash the container with tap water and let it dry, will there be any kind of contaminate left from the tap water that will contaminate the future RO-DI water?

 

[dollabill420]

Would be minimal, wipe with s clean cloth, if real paranoid I'd rinse with ro water