Bacterial Cells. Bacterial cells are very small-about 10 times smaller than most plant and animal cells. Most bacterial cells range in size from 0.2 to 10 microns or micrometers (0.0000079 to 0.00039 inches). Common Escherichia coli, or E.coli, bacteria are rod-shaped bacteria, 1 micron by 2 microns long.
1 Installing a concrete paver patio averages between $8 and $15 per square foot.  Stone: The most natural option, stone comes in several sizes, textures, colors and styles. Most homeowners opt for stone to create a design-focused patio. Installing a stone paver patio averages between $4 and $8 per square foot.
A 5,000 sq ft driveway might cost half per sq ft as a 400 sq ft patio. Taking these variables into consideration and giving a very rough idea on cost to clean and seal pavers per square foot you would be in the range of .90 to $2 per square foot. An average sized patio is in the range of $1.35-$2 for the thorough power wash, install polymeric sand ad seal with a wet look sealer.