Lowering phosphates with hydrogenated lime

[PoolDoc]

Czech,

There's an American idiom that applies here: you're "outsmarting yourself"!

Adding even 1% SiO -- especially in Arizona with its high mineral content water, and high evaporative rates -- is NOT something you want to be doing.

What's more, it appears you do NOT know what your calcium levels are.

And finally, I suspect you may be confusing 18° Baume (28% hydrochloric acid) with 18%.

Experimentation is great, but before you have a go again, you may want to (FIRST) get a good test kit, and (SECOND) do a bucket test BEFORE you do a pool test.

[czechtranslation]

Thank you, I really appreciate the advice and this site is a great resource.

[czechtranslation]

I am simple guy, I do not have SWCG, I use pool heater only to heat my external jacuzzi (I have in ground jacuzzi next to the pool with a waterfall to the pool from jacuzzi) - this is how it was when I bought the house. As there is no way to insulate jacuzzi and to heat it every evening in winter for 2 hours with 400 thousand BTU gas heater seemed to me a bit wastefull, I got older external jacuzzi, took out the 2 motors, put it next to the pool heater and pool pump and hooked it up to pool pump and pool heater and ti works like charm, keeps water warm and takes maybe 5-10 minutes to heat it every evening.

[PoolDoc]

Good deal! I'm glad you don't have a heater connected to the pool; all that calcium will not "play nicely" with a heater.