Thus, a genotype's frequency will decline or increase depending on whether its fitness is lower or greater than the mean fitness, respectively. In the particular case that there are only two genotypes of interest (e.g. representing the invasion of a new mutant allele), the change in genotype frequencies is often written in a different form.
1 Places such as Lowes and Home Depot will charge around $60 per day. 2  According to DoItYourself.com, they claim that average daily rental is going to be around $60 per day. 3  They also note that a good pressure washer should cost you around $350. 4  SunbeltRentals.com offers a variety of pressure washers.
But I can tell you I used a tool very similar to the one pictured above (found on Amazon for about $5). I paid about $2.98 for it at Loweâs (you can see it in the photo below laying on the shower floor). The idea is to go over all the existing grout and wear it down a bit. You can also use a power tool for this, but I opted for the cheapie method.