Cooling Slight water loss

I have watercooling blocks 2 G71, Lga 755 and NB chip watercooling and i have a cape coolplex resivoir and its water level has decreased but there doesnt seem to be a leak, is it possible that the tygon tubes have swollen slightly? To account for the misplacement

 

Tygon tubing is slightly porous - so you will over time lose a small amount of water without leaks.

 

Ahh kl thanks if i had to guess its lost about 4 cm height in a 5 cm diameter tube, so 4 * (3.1415*(2.5)^2) ml of water

 

That seems like a lot of water to be losing - it should be ~1cm/year max in that res tbh. Be wary of a slow leak somewhere...

 

i meant ml obv lol, over 8 months so about 70 + ml in 8 months, im not aware of a leak anywhere though it would need to be very marginal