Be advised always use half what the directions say, less salt build ups and happier plants. Clean the rez as needed but once a month is when I do. I have the original style round tube aeroflo. All aero systems use way lower ppms than other grow styles. I use H n G now but I have done Canna and others. GH had too much salt for me asthis will clog sprayers eventually so make that a regular maintainence item