Assessement

Overall, it was a huge success! We could bath almost every day, had a lot of friends visiting us and enjoying the jacuzzi and had no severe technical problem.

The sole issue that stands out is the annoying smoke of the chimney during foggy days. We now have to find a way to increase the combustion or force the exhaust of the smoke.

Some raw numbers of this experiment…

  • 3 kg Active Oxygene
  • 2 lt pH Minus
  • 1.5 lt Active Oxygene Activator
  • 45 Test Strips
  • 1.5 cubic meter of wood
  • 6 cubic meter of water
  • 48 hours bathing

Finger food party (3) – the last one

Today, it we will be one month since we have the jacuzzi… time for the last jacuzzi party.

For the last time, we heated the jacuzzi, prepared a nice buffet with plenty of finger food and enjoyed this last party. Tomorrow, we will disassemble everything and put it on storage until the next jacuzzi season.

Finger food party in the hot tub (3)
Finger food party in the hot tub (3)

Finger food party (2)

After a first party, we decided to renew the experience. This time, we worked on a new setup, where the buffet sits in the middle of the jacuzzi.

This was a huge success! We could enjoy the warm water and access the buffet at the same time. Due to the high number of children in the water, we choose dishes with high sides to protect the food from unexpected waves…

The downside of this setup, is that you have to continuously run the filter during two days after the party in order to clean the water…

Finger food party in the hot tub
Finger food party in the hot tub (2)

Water quality control (2)

Today is the big day! I finally found a way to mount my water sensors on the water circuit. After a lot of unsuccessful and/or wet tries, I came to the idea of using the same Gardena elements as my sprinklers. They provides a 25mm PVC pipe, Tee fittings with 3/4 connectors and barbs to connect to flexible hoses.

As I had some pipes left from my sprinkler installation, I only had to buy a set of Tees in order to assemble my sensors bypass. From now on, I only have to start the secondary pump in order to get some fresh water in the pipe to take my water quality measures!

pH and ORP sensors inline
pH and ORP sensors inline

The missing filling valve

In a rush to build the heating system, we forgot to install a filling valve on the heater circulation pipes. Yesterday, the heater was very low on pressure and I tried to use the exhaust valve as a filling one. The sole result was that the cabin was inundated and the pressure stayed low.

So today I went to my favorite hardware store in order to buy a valve and some plumbing in order to install a filling valve on the heater. As we already made a lot of plumbing work when installing the cooling system of the Provence datacenter, I had some previous experience on sealing pipes with oakum. Proudly, after the installation, no one leaked 😉

Heater with missing filling valve
Heater with missing filling valve
Brand new filling valve
Brand new filling valve

New filling valve mounted on the primary circuit

New filling valve mounted on the primary circuit
1 bar manometer reading
1 bar manometer reading

Jacuzzi control 2.0

Today I finally had time to upgrade my jacuzzi control center. The Raspberry Pi is doing its work since the first day, but we had no way to operate the jacuzzi from the cabin, without using our cell phones.

I first had to find a touchscreen monitor (thanks to Ricardo I found a cheap one in Chur) and a 7 segment display (from Adafruit). After some soldering and mounting work, I now have a control center to manually start or stop the pumps, display the temperatures and sensors graphs.

DIY vesa mount for the touchscreen monitor
DIY vesa mount for the touchscreen monitor
Jacuzzi control center 2.0
Jacuzzi control center 2.0
7 segments temperature display
7 segments temperature display

Finger food party (1)

First finger food party in the jacuzzi! We used the visit of an old friend as an excuse to throw a party in the jacuzzi.

As a first experiment, it was very nice! We put the buffet table beside the jacuzzi and had to circulate through the jacuzzi to pick some food and drinks.

Water quality control (1)

Water control in a jacuzzi is almost a full time job. Due to the high temperatures (37°C-40°C), the sanitisers degrade very quickly. Overall, we had to put almost 3 times more sanitisers as in a 20°C pool. To control water quality (pH and the presence of enough Active Oxygen in the water), we used test strips every day.

Today, I just received water sensors from Atlas Scientific to control the pH and the ORP level of the water. My goal is to mount the sensors inline on the heating circuit.

The first step was to mount the sensors’ pcbs and the multiplexer on a breadbord and to test the serial connection to a Raspberry Pi.

Atlas Sensors breadboard mount
Atlas Sensors tests

Leds are blinking and measures are sent on the serial bus… Next step will be to mount the sensors on the circulation pipes.

Updated water jets fixture

Yesterday my children discovered that they could comfortably sit on the edge of the jacuzzi holding onto the pipe of the water jets. Unfortunately, I missed that part when I assembled the jacuzzi and the pipe fell in the water.

Today I get some split ring hangers from a local plumber and secured the pipes to the lid. Now it will last every sort of hanging…

Installation of split ring hangers for the water jets (1)
Installation of split ring hangers for the water jets (1)
Installation of split ring hangers for the water jets (2)
Installation of split ring hangers for the water jets (2)
Water jets in action
Water jets in action

Updated lid control

We had some hard time to convince the children that closing the lid when they were in the water was not the best idea. However, some time it’s just too difficult to resist… So, before someone get caught under the lid, I changed the remote control of the lid and put a main switch on the control board in the cabin.

From now on, it’s only possible to open/close the lid when the main control switch is on. The rest of the remote control functions are unaffected (control of water games).

Lid opening control and command
Lid opening control and command

Interior design of the cabin

Last week, when we installed the jacuzzi, we had no time to really work on the layout of the cabin. After a week of use, we had enough experience in order to make the necessary adjustments… Again, after a trip to the hardware store, I had all the missing peaces in order to transform the cabin in a nice and tidy place to undress, make the fire and even supervise the children.

Control, pumps, filtration and the wood heater on the left
Control, pumps, filtration and the wood heater on the left
The wood heater with the hangers
The wood heater with the hangers
Lots of wiring to control temperature, pumps, lights and the hydraulic aggregate
Lots of wiring to control temperature, pumps, lights and the hydraulic aggregate