For others, a dab here and there or a good fill-up remains standard procedure. When it spits out pink, you know that the whole plumbing system has the antifreeze. Esser says he simply pours the fluid in, choosing a nontoxic, biodegradable product such as that available recreational vehicles' water systems. Although does make every effort to remove antifreeze in the spring, there's no reason to risk exposing future bathers to the propylene ethanol in standard antifreeze. Petroleum would cause the 0-rings to expand or deteriorate, he said.
Technicians also suggest paying attention to the spas' electrical contacts.
Exposure to humidity and moisture could lead to the formation of a white, salt-like powder, an oxide, that can interrupt the spas' normal operation. Once you turn the spa off, the spa reaches the same relative humidity level as the outside air. While there is no protective that won't burn off the contacts right away, techs must be ready to deal with them in the spring. On some of the contacts, it's as easy as spraying oil on a contact cleaner. However, on some of the units, you actually have to use a fine sandpaper and run it between the two contacts.