Then you do not toast the element if you flip the switch by accident. Then once the heater is filled, turn on the circuit breaker and then flip the switch as needed. See this pic of the circuit breaker on my T2499. Let us know if there is any wording at all on that switch. Good luck.
To lower the pH level of soil and make it more acidic, vinegar can be applied by hand or using an irrigation system. For a basic treatment, a cup of vinegar can be mixed with a gallon of water and poured over soil with a watering can.
1 So, you can prepare a buffer at pH 2 or pH 7, for example, but pH 9 would be pushing it. 2  Use the Henderson-Hasselbach equation to calculate how much acid and base you need. 3  You can simplify the calculation if you make 1 liter of buffer. 4  Select the pKa value that is closest to the pH of your buffer. Use the Henderson-Hasselbach equation to calculate how much acid and base you need. 2  You can simplify the calculation if you make 1 liter of buffer. 3  Select the pKa value that is closest to the pH of your buffer.