With a little tanks like these you will need to change your solution every weeks I guess , and check it almost daily as the plant will eat a lot of nutrients and it will makes EC/PPM & PH fluctuate so you will need to check these 2 values ( I would have done it daily ) . I know that some people have an extra bucket to easily change the water they just take off the lid and put it on the extra bucket and repeat with every buckets but it require to have an extra bucket so If yours aren't DIY it could not be that cheap. 😊✌️🏼