Hoping to get some advise on a course of action for a small Algae outbreak. First a background so you can hopefully point me in the right direction on what to do.
I have been testing my pool regularly with my new TFTestKit as we head into summer. I had to get my CYA levels up a while ago and in the process as that got sorted my FC shot up. On the 18th October FC was 16.0. To let that settle down I turned my SWG down to 1 and kept an eye on it. Was slowly dropping a few points per week and by the 8th November I was at 9.5 FC level. 1 week later though 15th November and I checked the pool to see it was looking murky and a brush showed algae was starting to take hold. Ran a test and FC reading was 0!
Anyway took to the pool, gave it a good vacuum and brush. I added Chlorine as per the Pool Calc. To aim to get back to 5ppm. Let the pump run for 24 hours and within a day it was visually looking Ok.
So one week on my FC levels are OK but Algae is visually still around in spots (Corners and areas I see it starting to take hold) So below are my readings from the last couple of weeks so you can see what has happened.
(Added Chlorine as per Pool Calc to get towards 5ppm) Tested 24 hours later and was reading approx 6ppm (Daily Test not drop test)
I also tested for CC today which gave a reading of 2.5. Visually the pool is not sparkling clear and I can see green algae in corners / steps in areas.
I know I need some acid but Before I go any further with Chlorine, can I get some advice on what I need to do? Do I need to shock the pool to knock this Algae on the head? Although I have all the above readings its still visible (not like a green swamp but there's something lurking)