History and Uses: 1  Oxygen had been produced by several chemists prior to its discovery in 1774, but they failed to recognize it as a distinct element. Joseph Priestley and Carl Wilhelm Scheele both independently discovered oxygen, but Priestly is usually given credit for the discovery.
Average Septic Tank Cleaning Cost. Average septic tank cleaning cost is $200 to $300 for a septic tank as large as 1,000 gallons. Prices can go up to $800 for a large, 2,500 gallon tank.There may be an additional $200 to $400 charge if the contractor has to find the septic tank and locate the opening, depending on the amount of labor involved.verage Septic Tank Cleaning Cost. Average septic tank cleaning cost is $200 to $300 for a septic tank as large as 1,000 gallons. Prices can go up to $800 for a large, 2,500 gallon tank.
1 The geographical location can play a rather big role. 2  For instance, a septic tank that has to be installed in Iowa can cost $3,000 to $6,000 for a standard install. 3  If that same septic tank has to be installed in California, the prices can be as much as double that. The geographical location can play a rather big role. 2  For instance, a septic tank that has to be installed in Iowa can cost $3,000 to $6,000 for a standard install. 3  If that same septic tank has to be installed in California, the prices can be as much as double that.