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Not an exact answer, but the bottom line is not so much that water quality degrades too rapidly. Here's a quote taken from this article.
Maintenance of the brine shrimp culture
Most people who hatch brine shrimp do so in a low volume batch. Once the nauplii are hatched, the culture is fed, and utilized for 2 or 3 days. After 3 days, the culture is often depleted of nauplii and a new culture, that was started the day before replaces the previous one. Some people desire a continuous culture, and this presents a few new problems. In smaller containers, water quality can deteriorate rapidly, especially as biomass and feeding increase. Furthermore, excess foods not eaten by the Artemia will decompose in the culture medium by bacteria, thereby deteriorating water quality due to a gradual build up of toxic substances such as ammonia and nitrite. Try to prevent overfeeding by observing the amount of food added during each feeding and wait until the culture begins to clear before you add more food.
Once a sizable population of nauplii is generated, it is often difficult to balance the need to feed the culture, and the resulting decrease in water quality from the pollution that feeding causes, especially when non-living feeds are used. Performing a 50% water change weekly will help overcome this problem. Additionally, siphoning and cleaning the bottom of the culture vessel every few days will remove accumulated detritus and prevent further water quality issues. If the goal is to have long-term culture then one should consider adding a small sponge filter or other nitrifying filter to the culture.
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