Identification of E. coli in water samples?

Hello. I am trying to identify E. coli in water after a smear and a simple stain with crystal violet. I am using the 140X magnification lens plus 2X zoom from a mobile device, but the images obtained do not provide a clear visualization of E. coli cells. I attached two images of E. coli pure culture as examples. Do you have any recommendations to improve the identification method or the quality of the images?

Thanks!

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