Pool Refill Done - Here's Chem test Results...

[Drewmich]

I drained our 6 yr old gunite pool - made some minor repairs - light power washed some scale off the black onyx plaster finish - refilled the pool yesterday and today - 20,000 gal.

This is a SW Pool - but I haven't added salt ...waiting till pool is in chem balance.

I just ran chem tests ---
CL - .62
TCL - .97
CYA - 15
PH - 7.6
ALK - 157
CH - 114
COP - .3
IR - .1
SAT INDEX = .042

My chem goals have been in the past year ....

A - Sat Index to .00 or maybe - .1 or .2
B - CL - 3.0
C - PH - 7.2 (try to keep it a tad acid to keep CH scale from forming as it has been a problem in the past)
D - ALK - 70 - 80
E - CYA - 40
F - Salt - 2400
Copper & Iron at .00

Any recommendations for me on what my ideal chem levels should be or changes to my goals?

Thanks

 

[Mr Bruce]

How are you testing?

 

[Drewmich]

With the same tester I've used for 4 years - LaMotte ColorQ Pro 9-Plus. I test my Salt with the Taylor-K-2006 and also have the Taylor T-100 ... but find I get as accurate or better readings from my LaMotte Digital.

 

[Drewmich]

Today's chem readings
CL - 1.60
TCL - 1.79
CYA - 25
PH - 7.6
ALK - 157
CH - 134
COP - .3
IR - .1
SAT INDEX = -0.10

Plaster pool ... I've added a 2nd gallon of Chlorinating Liquid this AM (added first one yesterday - first day after pool refill) with the goal to get the TCL up around 3.0 which is an good level for my pool. Probably will be end of day or Thursday ... then I'll re-check chems ... see what my CSI is ... I am thinking I'd like to get the ALK down to 70 or so and keep PH at 7.6 or 7.4 ... CSI at 0.00 is also a goal to protect the plaster and keep scale from forming on the black Onyx finish.

Any recommendations?

 

[Drewmich]

Once the chems are good and stable ... then I will add salt to 2400-2800 and then work on the CYA to 40-50.

Any feedback from the chem pros here? Thanks for your help in advance.

 

[mknauss]

With your low CH I would not push the TA low. Also keep pH in upper 7's. Be very wary of aggressive water, especially in the winter when the water temperature falls.

 

[mknauss]

Also = ColorQ is known for less than accurate CH readings.

 

[Drewmich]

Thanks! My ColorQ CH readings last uyear were consistent with my Taylor kit. But I will verify again.

 

[Drewmich]

Are the copper and iron readings anything I need to deal with?

COP - .3
IR - .1

 

[mknauss]

IF copper is really 0.3ppm, that is the level at which we see staining start to occur.. a large water exchange would remove it.

 

[Drewmich]

I just refilled the pool - 20,000 gal. Must be copper in the city water? What is the best method to remove it - besides a draining again - which probably wouldn't change the COP reading?

 

[mknauss]

I said IF there is copper. With a new fill, that is not likely. I suspect your test is not correct.

 

[Drewmich]

Just took it to our local pool supply house - they tested and .3 to .4 copper.