UK Pool opening - unexpected test results in my SLAM

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molokoid
Pool Enthusiast
Pool Enthusiast
Posts: 29
Joined: Sat 26 Jan, 2019 07:10
My Pool: Roman Ended 10.5 x 4.5m outdoor pool

UK Pool opening - unexpected test results in my SLAM

Postby molokoid » Tue 30 Mar, 2021 10:08

Hi all, hoping i can get some experienced guidance as to which way to go from here...

UK based, started pool opening a week ago. Vac'd to waste, brushed, tested and everything was looking good in terms of its ph, Alk and CYA. So I started to SLAM by dosing with 10l of 15% liquid chlorine. That seems to have done it's intention on the algae and i've a clear colour (if a little cloudy set of water). So, my quandry... Alkalinity had dropped below target range according to Pool Math (down to 17) so i used 5kg of Sodium Bicarb.

Free Chlorine is now measuring above the range of my ColorQ and has been for three days now, pH is in range, TA is 30 and CYA is 21.

Is my next step to load up with more Alkalinity Builder?

TIA


Teapot
Pool Industry Leader
Pool Industry Leader
Posts: 1330
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: UK Pool opening - unexpected test results in my SLAM

Postby Teapot » Tue 30 Mar, 2021 12:03

Remind us of your pools construction, vinyl, grp, plaster tile etc?
If your alk is 30 I wouldn't be in too much hurry to increase it, judge if your pH remains stable.
molokoid
Pool Enthusiast
Pool Enthusiast
Posts: 29
Joined: Sat 26 Jan, 2019 07:10
My Pool: Roman Ended 10.5 x 4.5m outdoor pool

Re: UK Pool opening - unexpected test results in my SLAM

Postby molokoid » Tue 30 Mar, 2021 14:20

Thanks Teapot, i erronously thought it would add as my signature!

19000gal, in ground, vinyl.

I'm just about to do another ColorQ test actually.
molokoid
Pool Enthusiast
Pool Enthusiast
Posts: 29
Joined: Sat 26 Jan, 2019 07:10
My Pool: Roman Ended 10.5 x 4.5m outdoor pool

Re: UK Pool opening - unexpected test results in my SLAM

Postby molokoid » Tue 30 Mar, 2021 14:41

Hmmm, if i test in real time, the FC is High out of range of the ColorQ.

When i do the test again on the same tubes (that have been sat there for 4 or so minutes), the FC is in range and comes out at 5.4, so my results are...
FC 5.4
ph 7.3
TA 29
CH 90
CYA 23

So on this basis do you think it's safe for me to exit SLAM and go to stabilised chlorine and floc?
Teapot
Pool Industry Leader
Pool Industry Leader
Posts: 1330
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: UK Pool opening - unexpected test results in my SLAM

Postby Teapot » Tue 30 Mar, 2021 15:31

Did you do a total chlorine?
Sorry details maybe in your signature but on a mobile they dont show up.

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