Conclusion

For this test, we collected both a water sample and a smear sample from four different water collectors. Two of the water collectors were plastic and two were concrete; each of the four collectors was from a different downspout on one side of a building.
In the water sample from the first plastic water collector (#1), there were several rotifers and many ciliates. In the water sample from the first cement water collector (#2), there were some cyanobacteria. In the water sample from the second plastic water collector (#3), there were a few rotifers. And in the water sample from the second cement water collector (#4), there was a rotifer, a nematode, a few ciliates, and some algae.
In the smear sample for #1, we found one worm and one amoeba. In the smear sample for #2, there were five unknown organisms. In the sample for #3, there was some algae. And in sample #4, there was one unidentified bug.
In conclusion, it appeared that the plastic water collectors were more conducive to microlife because the majority of ciliates and rotifers were found there.