This is a salwater pool, where you need to make up for lost chlorine ions by adding hydrochloric acid (HCl). Even wikipedia understands it this way: https://en.wikipedia.org/wiki/Salt_water_chlorination
En zelfs: "Use of another acid, such as sulphuric acid to neutralise pool alkalinity will reduce the pH but will produce sulphate ions rather than chloride ions. Sulphate ions conduct electricity equally well as chloride at the electrode, but will not produce any chlorine. A salt water pool "poisoned" with sulphate may have to be drained and refilled to remove the offending sulphate ions."
But, what is on the label of our small (now depleted) tank, apart from it being a product especially for "Cloractión Salina"?
SULFURIC ACID!
Engineer Jansen is quite (sul)furious.
All very well, but there still is an electrical system to switch on to disinfect and clear the water: the chlorinator that is part of a saltwater pool.
This very interesting box has a lot of switches, an RCD, and a timer clock, etc. But, the swimming pool computer also has two timers. Which controls which here? The constructor, plumber and electricien did not know. Right.
Time for engineer Jansen to temporarily be not be a pensionista, and get to work.
There are two options.
A. you control the pump using the timer clock in the box on the right. If you have connected the whit cable as indicated in the installation manual's paragraph 3.3.3.1 and removed jumper LK2 from the motherboard of the computer, the computer checks if the pomp is getting power. As soon as that is the case the chlorination program starts. The two screw connectors are labelled "filtro0" and "filtro1" for clarity.
B. you control everything with the pool computer. You need an external relais to switch on/off the pump. We don't have that external relais, so we opt for option A.
(Jumper LK2 is now stored at the bottom of the computer box, under a piece of tape, to prevent losing it.)
The white cable is highlighted orange in this schematic. For clarity.
There was a little grid covering the entrance of the suction pipe the pump uses to suck water from the reservoir to the filter. The pump stopped twice, all by itself, and was quite warm. We think the grid was a bit too small. And it does not stop drowned wasps entering the suction pipe and ending up in the pump's fiter. Here is the engineer Jansen™ solution
