I have discovered this fantastic forum/side as most of the people here after running into some trouble.
And as with most people the trouble in none other than algae!
having read most of the pool school I have gone out and purchased the suggested test kit.
I have also identified a good source of 12% liquid chlorine which is now my only chemical (other than the ph- I use when needed)
Having performed my first set of proper tests I have discovered that my CYA is well above 100 (closer to 200).
I will dilute a sample 4 times just to see if I can get an approximation of the real value.
My intention is to do a water change.
My pool is finished with beadcrete so I have been advised to wait for the water change until the weather becomes cooler.
I have also been adviced not to expose beadcrete to sun with no water in the pool, so I will run the process during late afternoon.
My question is as follows:
Should I do a partial water change (say 80%, or whatever I get from pool maths) so as to arrive at the desired CYA. Since my algae problem is not gone I will then have to follow the instructions for a proper shock treatment (as documented in pool school) which should solve my problem. Or ???
Should I do a full water change and then add some dichlor (just enough to get to the desired CYA) instead??
Will the full water change help me get rid of my algae problem??
Are there any other pros and cons associated with a full water change rather than a partial (and vice versa) ??
I have been keeping my FC pretty high and been scraping the pool pretty often so the algae is there but not complety out control (the issue becomes visible after 3-4 days).
Cost of a full water change will not be very different to a partial water change