Water Coolant Level

HI



I think i am losing water from my MGF 2001 , i keep checking the coolant resevoir , just had to put another litre in this morning , was out in the car afew days ago



i have recently had the pressure checked due to been concerned at a garage with a pump and all seemed well with pressure etc etc and the could not see any leakages from the pipes



just looking for ideas on what i might be or what i need to look for



thanks in advance

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