In general, you don’t want to store greywater. Most codes allow 24 hours maximum. If the water is treated that time can go up. But with greywater there is typically fresh greywater generated ever day, or every other day, so storing it doesn’t usually make sense.
If you are able to rethink the system I would encourage you to look at a rainwater storage tank for longer term storage of water. If, for what ever reason, you must store greywater, then you’ll need more robust treatment to avoid the odor issues you’re encountering.
Treatment methods differ, but generally you’ll need to filter out the large particles with a mesh type filter, then a smaller filter, then you’ll need to remove the rest of the nutrients. Constructed wetlands are a natural method used for this purpose, in some systems.
Without knowing a lot more about your situation I can only offer this general advice.
Good luck with it!
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