Today's repeated server crashes have been caused by Water Strainers.
You may want to disable it's creation. Earlier today I saw someone make a few before he found out they were disabled, and they just kept disappearing. He lost the resources used to make them. >.<
From what I read elsewhere a strainer MUST have an exit pipe, the description said that if any fluid other than water entered the strainer and there was no exit then it would crash and would require editing the map to remove the strainer before it could be restarted.