Smelly cloudy water

I've introduced big bud bloom for the past 3 weeks. My method is pour 25l of water into an open container. 24 hrs later add all nutrients which is cannon a and b and big bloom. The water lasts me a week. During the week there is a lid on it. I've noticed it is getting smelly. Is this normal or am I doing something wrong?

Anyone else used advance nut big bud? Do you follow the instructions on bottle?

Any advice great!

if your mixing a weeks feed and leaving it in a container and useing it as you need it may be getting stagnant due to no movement in the water adding a airstone in the container would sort this out or maybe you could just mix up just enough feed that you will use