I have a curly one that is a little beyond me but might be pretty straightforward to you guys and would appreciate the help.
I have a Zodiac LM3-24 salt water generator which is rated at 24 grams of Chlorine per hour at full output. It has 5 levels of output and I assume that level 5 is 24 gm/hr, level 4 is 19.2 gm/hr ..... level 1 is 4.8 gm/hr. To regulate the output of chlorine, I can vary both hours per day and the output level. It is oversized for my pool at 12,700 gallons/48,000 litres but that is what I have and was a few hundred dollars cheaper than the smaller one recommended for my pool.
How do I work out how many hours to run it at and at what setting to raise the FC level a certain amount?
On the pool calculator, down the bottom, if I select 73% cal-hypo and 33 grams (is that the same as ~24 grams of 100%??) it says that FC is changed by 0.5. Do I then assume that I am increasing FC by 0.1/level/hour on my SWG. So if I run it for 4 hours at level 1, I am changing FC by 0.4 (same as adding 26.3 grams of 73% cal-hypo??). At the top end, if I run it for 8 hour at level 5, it would increase FC by 4.0. The superchlorinate button runs it for 24 hours at level 5 so I think I want to stay away from that (raise FC by 12.0). In any case, do those numbers work or is it not as simple as that?
I test the water once a week on the weekend and would then set the SWG to run for the week based on that setting.
Currently CYA - 39, FC - 4.4, pH- 7.5, TA - 130, CH - 330 (was 260 last week so am a bit suspicious of the pool shop testing on that one)