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Most portable spas are not winterized, many spa owners find that winter is one of their most enjoyable seasons with their hot tub. But, if this is a summer home, or if you are more of a 3 season spa user, you can shut down the spa for the next 3-4 months. Power outages or maintenance needs may also make you decide to winterize the hot tub. If a tub full of water were to freeze hard for several days, it can destroy a hot tub beyond repair.
Essentially the process is the removing all water from the spa equipment, pipes and hoses. Any water left in the spa can grow stagnant bacteria, or if there is enough to fill a tight space in the pipes, it will freeze and expand, and crack pipes or equipment.
Using a product like Tub Rinse, added to your spa the night before draining will remove bacteria formed in the pipes or jets. If untreated before draining the water from the spa, the bacteria can thrive with just the moisture left in the pipes. This is a very important step that should not be overlooked, or dismissed as spa suppliers just trying to sell another chemical. :-) We do like to sell spa chemicals, but really - this one is a very necessary chemical. Use twice per year, and always before draining the spa for an extended period of time.
Open up the spigot on the bottom of your spa, most spas will have one that you can attach a garden hose. A small submersible pump can also be used. A siphon could also be used, with some degree of success. In addition to the spigot, remove any drain plugs you have on your pump or filter, or unscrew the unions on each side of the equipment (don't lose the o-ring), to allow all of the equipment (pump, filter, heater...) to drain out.
Once the spa is drained completely, and the lines are blown out, use towels or sponges to get any remaining drops of water, and allow the shell to air dry for several hours with the spa cover removed. It's important to remove every bit of water, from the pipes, seats, floors, equipment - everything.
When the spa is nearly drained, turn on the spa blower (if you have one), and let it run for several minutes. If you have air controls for the blower (jets or seats, for example), adjust the controls so that the blower is forcing air into all areas.
You can blow the lines out, or suck them out with a wet/dry vac (just reverse the hose). Use a large wet/dry vac, and seal the end of the hose up against the hole in the bottom of the skimmer, and the drain, and on all of the spa jets. Depending how your jets and plumbing are arranged, you may have more success with vacuuming, or vice-versa, with blowing. Usually, some combination of both will be most successful.
In most cases, for the spa jets, you'll want to start up at the higher jets, and work your way down to the floor jets. Seat air jets or ring jets take some precisely focused air and a dry towel laid across the bench or floor to absorb the water as it spits out of the air jets. When vacuuming, a sheet of plastic may be helpful, to cover other jets connected to the same manifold, to increase suction on the jet you are vacuuming water from. Blow or suck (sorry), the air until you no longer see any water or mist being extracted or pushed out. Important!
Non-toxic RV or Pool antifreeze can be used as a last resort, but it can get a little slimy and smells bad, so I'd advise you to do without, unless you are not certain that all the water has been removed, with no puddling areas inside air or water manifolds or pipe.
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