How to Drain a Hot Tub...Quickly!
Knowing how to drain a hot tub is one thing. Knowing how to drain a hot tub quickly is another. It can save so much time in hot tub maintenance! The average hot tub should be drained every 3-4 months, depending on frequency of use, water quality and other factors. Using the drain plug alone or siphoning water through a garden hose can take hours and hours to complete. In this blog, we’ll introduce you to some quicker methods for draining a spa or hot tub in minutes.
First Things First
Before getting started, check local ordinances to make sure you are able to legally drain the spa. Can you drain it into the yard? Can the water drain into the street? Is there a sewer hookup nearby? Perhaps there’s a draught in the area, and water conservation measures are in effect. Knowing this info before getting started will save you from headaches later on.
A couple times a year (or more), it's a good idea to purge the plumbing in your hot tub. Bacteria, body oils and other organic matter form layers of nasty biofilm, which can lurk in the pipes and cause skin irritation or illness. Using a cleansing product like Jet Clean breaks down the biofilm so it can be removed while draining. Just add the chemical, turn on the jets, and let it circulate for 20-60 minutes, following label instructions on time and dosing. Don’t fret if brownish, foamy goop comes to the surface - this means the cleaner is working!
After the lines have been purged, turn off all hot tub functions and flip the circuit breaker; you don’t want the pump or heater to come on while the water level is low. Remove the filter for cleaning, and assemble your supplies...it’s time to drain the hot tub!
Draining the Hot Tub
There are couple of easy ways to quickly drain a hot tub. Either method can be used in addition to the drain plug or combined with other draining methods for maximum efficiency.
The fastest way to drain a hot tub is to use a submersible pump. The speed of draining the hot tub depends on the flow rate of the pump. For example, if you pick one that can remove up to 30 gallons of water per minute (1,800 gallons per hour), you won't have to wait very long. The math is pretty simple - a 450 gallon spa can be emptied in as little as 15 minutes flat. Yes, you read that correctly!
Automatic pool cover pumps or submersible pumps are nice, because they include a sensor to automatically turn off once the spa has been emptied. Since you won’t have to babysit the pump, use this time to clean the spa filter or get started on the spa cover. There should only be a little bit of water left in the bottom, which can be removed manually or with a wet/dry vac.
Shop Vac Siphon
Another fast method for draining a hot tub is using a wet/dry vacuum to get a siphon started. Drop one end of a long vacuum hose into the spa, and connect the other end to the wet/dry vacuum. Turn it on for a few seconds - just long enough to let the hose prime and get the flow moving. Turn off the vacuum, and quickly disconnect the hose so the water can flow out onto the ground.
Though not quite as fast as using a submersible pump, this method can still empty out an average-sized hot tub in a matter of minutes. The large hose diameter makes it much more efficient than a garden hose siphon. The nice thing about using the vacuum hose is that while water is being siphoned out of the spa, you can use the “wand” end to remove dirt and debris from the floor and seats. Once the water level is low enough that the siphon isn’t pulling water anymore, hook the hose back up to the wet/dry vacuum to remove the last puddles of water from the tub.
If you’re going to be leaving the spa empty for a while, don’t forget to remove water from the lines, too. A new layer of biofilm can build up quickly if the water is allowed to stay in the pipes, and you’ll be right back at square one when you refill! This can be done with a wet/dry vacuum to blow and/or suck the water out. Or, if your spa has one, briefly turn on the air blower, making sure all jets are open first. Remember to turn the power back off once you’re done with the air blower.
Thoroughly dry the tub with a soft towel. Next, use a spa cleaning chemical to remove tough scum and protect the tub surface. Finish cleaning (or replace) the filter cartridge, clean and condition the cover, and hose off the spa cabinet if it’s looking dirty. If you’re not refilling the hot tub right away, allow the filter to dry completely, and store it indoors.
Of course, you can always just use the bottom drain on the hot tub and wait for several hours. Then again, the faster the hot tub is drained and cleaned, the sooner you can get back to using it!