Winter is coming! The following instructions are general guidelines to assist you in properly winterizing a spa. It is recommended that this service be provided by an authorized service facility if possible. The steps may differ slightly depending on the particular spa model.
Turn off the power to spa at the breaker. After draining the spa, disconnect the unions from the pump(s) and use a high volume shop vacuum (3HP or higher), to blow air through both the discharge and suction on the plumbing lines.
With the shop vacuum on, move the diverter valve from one position to the other and open and close each jet until no more water comes out of the jets.
Connect the shop vacuum to each of the plumbing lines and suction fittings (essential for models with two speed pumps and 2″ check valves) and blow/suck out the lines until there is no more evidence of water, gurgling sounds or mist coming from the suction fittings in the foot well of the spa.
Vacuum any residual water from the spa and remove the pump drain plug(s) and leave the pump unions disconnected in case rain water makes its way into the suction fittings or drain.
Remove the filter and plug the smaller suction port in the filter bucket. Attach the blower to the main filter line to clear any residual water from the circulation pump plumbing.
Open and close the waterfall valve (if applicable) until the water is cleared from the waterfall plumbing.
Remove the plumbing connections from the heater and blow out the heater. Leave these disconnected.
Remove the plug from the smaller port in the filter bucket and blow any residual water out of this line. Check all ¾” lines for any residual water and disconnect the unions or remove clamps and hose and remove the drain plug (if applicable) from the circulation pump. Blow these lines and the circulation pump out. Leave the unions disconnected. Wipe out any residual water and then cover the spa with a tarp to prevent water intrusion. The spa should be tarped in such a manner that seals and prevents rain or snow from entering through the cover and the tarp should be attached securely enough to handle adverse weather conditions.