loop_pea said:I'm so glad my pool isn't in Denmark! I wouldn't be able to keep within the law. You definitely need automatic dosing to keep everything in such tight ranges, and we don't have that.
Since you will be measuring FC at around 2ppm then I think you do need a photometer. They work really well in that range, and having digital measurement eliminates variability due to bad eyesight, colour blindness or lighting. We use a Lovibond checkit 3 in 1, which is their basic model that checks FC, pH and CYA. I like the CYA test very much. It seems less subjective than the black dot test so long as you have a consistent technique (you have to shake it up and retest a few times, the equivalent of pouring it back and forth in the black dot test).
We use a tablet count method for TA and CH which is a tablet version of the tests they recommend on here where you add reagent and look for a colour change. Those were very cheap to buy.
Yeah, it has been a pain in the butt till now just to have authorised that we can suffice with a turn-around-time for the water higher than 2 hours. The rules for a pool below 1.50 m depth requires us to recirculate the water in 2 hours or less. For our pool that is theoretically 26 m3/h. Luckily we have been approved to just stay below 5 hours, as our pool is almost 1.50 in depth.
Regarding the photometer, I think that is also the general opinion... that we need something digital... and we need it pretty soon actually.
However, there is general attraction to the eXact Micro 10 photometer. It is a shame that I cannot find any user reviews or similar indicating if it's worth it.
The eXact seems a lot more simple to use than having to handle a vial, carefully filling the correct amount, avoiding fingerprints etc. as is necessary with the Lovibond Checkit / MD200.
BR, Martin