i use sienna x spray tan and i taught my sister how to use my gun so she could spray tan me! haha, i went to butlins back in feb and i know there pool is filled to the brim with chemicals because it was an 18-30s weekend so they just assume dirty people will be going in there with hangovers and what not, but i decided id go in the pool for an hour max, which i did and my tan was fine, abit faded but ok, THEN i decided to bop around the water rapids for abit longer, ended up in there for about 3 n half hours, bye bye tan... it was kind of still there but really faded and my fingers were really patchy, but on the other hand like i said the pool was full with clorine (however you spell it) it was so bad it made my eyes burn (and i was wearing goggles) and my face went all crusty with flakey skin, so it just depends what sort of pool shes going to i suppose? i def wouldnt recommend staying in aslong as i did! i just had to top up my tan with an instant wash off tan for that night x