Can tanning creams and milks have a negative effect on plants?

No. But the oil film floating on the surface of the piscina biológica® looks very ugly. To avoid this effect, and to reduce the entry of harmful microorganisms into the water, it is mandatory to take a shower before entering a piscina biológica®. As well for hygienic reasons, each project has to have a shower near the entrance for all people to clean their skin before showering.