You can get pool chlorine at bunnings or a larger pool shop. Check the prices as some pool shops get it delivered in bulk and it can be cheeper than bunnings. Bunnings is similar to a Home Depo or Lowe’s in the US. If you’re going to use a coles or Woolies bleach it needs to have no additives, like scented etc. Plain bleach is ok but you’ll probably find pool chlorine at 12% will be the same cost wise.
A pool or tub is a bit like a pet, a little daily attention goes a long way. You need to maintain a free chlorine, FC, residual. Your FC needs to be maintained as per the chart previously posted. You need to know what your CYA level is to maintain your pool/tub the TFP way.
See hear for tips on the CYA test,
www.troublefreepool.com
Cyanuric acid (CYA) is the chemical name for the product commonly called “pool water stabilizer” … Read more…
www.troublefreepool.com
I like the fill to the line method,
As much as possible, you should do the CYA test in the same consistent light conditions:
- Outside in full sun or use the brightest indirect indoor light that you can if you have to test at night
- Back to the sun
- Don't stare at the dot as you pour
- Fill to a line, hold the tube waist high, and glance at the dot
- If you see the dot, fill to the next line and glance at the dot
- When the dot disappears, you round up the previous line. If you saw the dot at 40 and not at 30, then you call it 40
After reading, you can pour the mixture back into the mixing bottle and try it again; repeated readings on the same sample will give you confidence in the result.
“iluka sea minerals have you ever heard of that ?” If you've got plenty of money to waste give it ago, but its just a fancy salt that you dont need.
The banish is a phosphate remover, a flocculant. You add it, let it settle and vacuum it to waste. You don't need it, if your phosphates are really supper high you would be better and cheeper to drain and refil.
The clarifiers can clog up your filter, stay away from them. Stay away from anything that pretends to be a ‘miracle’ cure.
You’ve been running with no residual sanitiser and I suspect you need more then just water change. I imagine you have a bit of a biofilm growth and need to clean it out with a spa and hot tub treatment to clean out all the plumbing.