Physical - color of water of O - almost transparent - E- slightly colored due to high concentration of Plankton.
Light penetration in O- substantial - in E - quite lesser than that of O.
Electric conductivity - less in O - higher in E.
Chemical.
DO2 in O lesser than that of E.
Alkalinity in O lesser than E during daytime,O less acidic then E during night time.
Hardness in E more than O.
Equilibrium CO2 always used up in E, but not in O.