Tidal Springs don't return all their input

I just tried this over 150 cycles and I cannot see any loss. Maybe you have some other issue that causes liquid deletion?

Update: At 600 cycles I still see no effect. 

Update 2: At Cycle 1700, I have no deletion effect with several springs that are encapsulated and have a single gas or vacuum on top.
But I have one with two gases on top and that one lost approximately 1t of salt water over 600 cycles and went from 14.5t peak fill to 13.5t peak fill.
Hence I think the spring does not delete liquid, but there is some liquid-deletion effect on top of it if 2 different gases are present under some circumstances.

Here is what I use. In there is one liquid, one gas and with all 15.5t in the spring, there is about 50kg left in the 3 tiles on top. 

 

Edited May 28 by Gurgel