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Not a great camera, but as you can see we are about back to swimming, fc is around 15, so need that to come down some more. Taken just over a week, with FC at 25 ish, seemed like a long time. Thanks all on here for the help given.

Thanks, will post next check.

Thanks. Struggling to get a consistent read at the moment, will have another go. My OTO kit says its OK, but the test strips register it as very low.

OK, some help please. Problems with translation means we have dosed pool with around 7 litres of hydrochloric acid at 22%. From what I read this is used in pools to reduce pH, so hoping not too serious, but anyone advice please?

Will check for jellyfish, lols :)

Also could sulphur have played any role, adjoining field was sprayed with sulphur powder prior to issues?

So managed to find a test with CYA after some hunting (Astrapool test strips). So I didn't expect this, a reading of Zero! Now test kit says that CL should be normal for best CYA result, but don't imagine its that wrong.. Thread below is interesting also...

What I don't understand about the cya/chlorine chart is that my OTO kit chart has ideal CL between 0.6 and 1.5, so think I am maybe misunderstanding something?

Only used these tabs for a few weeks, but have used other brand tabs for years, so am now concerned about cya level, searching for a test kit, as would prefer not to wait for mail order.

The green circle is a white compass in tile. Use 4 tablets per week. Yes, we have filter on 24*7 at the moment. Thanks again for taking the time to reply, good to know am on right track.

And here are the tabs most recently used.

Here are the photos this am, certainly more blue/green now. Another 1l of bleach at 9am.

Thanks, will look at chlorine blocks used in past and post ingredients. Been using bleach (14.5%) pool specific to dose on last two doses, level does seem to be dropping then am boosting back up last 4 hours. Will sort SIG. Yes, read the slamming section several times, so testing regularly and...

After reading here would like to know cya but only currently have simple pH/chlorine test kit.

Hi, thanks for the reply, added a specific pH reducer from hardware pool section. Ingredients of chlorine crystals is (sorry Spanish) 97% acido tricloroisocianurico 3% acido borico

Checked fc again and was yellow so around 15 so added 1l of 14% bleach and got back to what I think is 25, going to test and up level tonight..

Hi, we have a 12*6*1m pool which over the last couple of days has turned a deep green. The pH was 8.2 but balanced that back to 7.6 and raised fc to 25 with 2kg of cholro crystals but its been like that for 24hrs with no change in colour. Don't have a test kit for cc (looking for one in rural...