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.
Once you've talked to a professional, the cost to install a septic tank will mostly depend on the type of tank you choose as well as your professional. Concrete tanks are the most common type of septic tank. The cost to install a septic tank made out of concrete is in the average price spectrum.These tanks are susceptible to cracking or separation, but are usually durable for a couple of decades.oncrete tanks are the most common type of septic tank. The cost to install a septic tank made out of concrete is in the average price spectrum. These tanks are susceptible to cracking or separation, but are usually durable for a couple of decades.