I've decided to add the borates. I kind of accidentally bought 8kg of boric acid off eBay so I'm kind of committed now. To be completely honest I guess I was already committed, boric acid is a bit hard to get hear, borax at $10 for 1kg from the local hardware is the easiest to get source of borate. I've already added 1kg of borax with 500ml of HCl (33% muriatic acid) which in 30,000L should bring me up to 5ppm borate.
The plan was to raise my borates to 50ppm and not worry about testing for borates until the start of next swimming season. I'm more than fairly certain that our pool has never had borate in it. Our last published tap water quality test lists boron as <0.1mg/L.
From the pool math calculator 7720gm of boric acid should give me another 45ppm of borates and the total 50ppm target. I recall a real application of 40lbs in a 16,000 gal pool to get to 50ppm, which is roughly 9kgs in 30,000L to get to 50ppm, or 1kg per 3350L to get to 50ppm.
Sorry for the long post that as gone nowhere so far. I had asked Matt (JoyfulNoise) about adding borates from the mannitol borate test thread and don't want to use the mannitol test or hijack that thread. Thanks again Matt. I've copied the link and relevant quotes below.
My plan is to get some test strips before I add any boric acid so I can test at 5ppm and then at each 2kg addition to at lest get some experience with the test strips. Good plan?
Which test to get? My options are;
LaMotte 3017-G at $55 for 12 tests or,
AquaCheck 2012LB at $40 for 25 tests.
Is the LaMotte that much better?
Do my numbers add up? My pool if ~29,000L and I've used 30,000L in the calculations to make them a bit simpler and ensure I under shoot a little.
JoyfulNoise - Test for Borates