I have not checked if it is still working the same way since but can.
The water being pumped to it had been filtered previously and none of the polluted water being fed to it was salt water nor causing damage to other buildings using the polluted water before it went to the sieve. I checked all the pipes and confirmed there was no salt water in that system. I waited and watched the sieve and specifically saw the nodes of salt water exit the sieve.
It might just be a fluke since I didn't see it in any other forums and was not yet reported. I will see if I can reproduce now.