I adjusted my pH up today as it was a little low at 6.9. I used poolcalculator.com, entered all my values and it advised to add 2430g (5.3 Pound) by weight of washing soda or soda ash. The pH usually drifts up by itself and it did however a lot of rain lately drove it back down.
I purchased a 2.5kg (5.5 Pounds) bag of soda ash and added it in three batches after mixing in a bucket.
The first problem I encountered was very high pH, well over 8.2. I left it circulate for several hours however the pH was still off the chart. Out of curiosity I used another calculator, Pool Boy on my phone. It advised me to only add 1.7kg of soda ash for a .5 pH increase.
The second problem I still have is cloudy pool water. It's very foggy, however I can still see the main drain. I thought this might have been due to high PH so I started to add acid. First off using poolcalculator it advised to add 840ml (28.4oz) of 34.6% acid to lower the PH from 8.2 to 7.5.
With the acid added, the pH started to lower and then stopped at about 7.8. I used pool boy on my phone and it advised that 2.1L (71oz) should have been added. I continued to add the remaining amount of acid. The pool is now at a good 7.4 however the water is still cloudy.
My current levels are:
FC - 7
pH - 7.4
TA - 100
CH - 440
CYA - 90
TDS - 2800 - Most likely due to salt from liquid chlorine.
Problems I have are:
Pool is still cloudy, should I add some Alumina Salts? EG clear tabs for sand filters.
Why did poolcalculator give what appears to be incorrect measurements? I made sure my pool volume was correct and double checked my targets.
A bit of background if required.
My testing results are from a couple of different sources. Not the best I know however it seems difficult if not impossible to get a Taylor test kit in Australia. I use a Rainbow lifeguard 4-in-1 test for fortnightly checks as well as a AquaCheck TruTest digital strip reader for quick checks during the week, before and after swimming ect.
For other things such as TDS and CH, my local pool store checks for these things a few times a year. They are a family run business and after educating myself here, they don't oversell and give advise that closely matches that of TFP.
Further background on this pool: I moved in just over two years ago and the previous owners used Trichlor pucks in combination with CalHypo even though the system had a liquid acid and chlorine controller?!??. This of course lead to CYA of over 150, very high CH and hard to manage water. I did a half drain shortly after moving in and put the pool back on liquid chlorine ($20 per 15L in AUS). Since this things have been quite good!