We recommend not using over a 50/50 mix. of propylene glycol. Ethylene glycol shall not be used. Under no circumstances can the product contain a petroleum base.
No. The material in our diaphragm will not tolerate petroleum-based products.
You must completely drain the tank to check pre-charge. To do this, shut the power off to the pump and open (turn-on) a faucet in the house. This will drain the tank and not allow it to refill. On the top of the tank you will find an air valve (similar to the air valve on your tires) – use a tire pressure gauge to check the air pressure.