White opaque coating & black spot!

Total hardness and calcium hardness in pool water.
Scale, calcium buildup, hard water and scaling problems.
grador
Pool Newbie
Pool Newbie
Posts: 2
Joined: Sun 19 Apr, 2009 12:48
My Pool: fibreglass, below ground, 8 x 4, 48,000 ltrs, salt treatment, sand filter.
Location: France

White opaque coating & black spot!

Postby grador » Sun 19 Apr, 2009 13:07

Hi,

I have a fibreglass in-ground pool approx 8 x 4m. It is just coming into its forth season and I operate a salt treatment generator. I live in a hard water region.

At the end of last season I noticed a white opaque coating over the entire pool, below the water line. At first I thought it was colour bleaching (it's a blue pool) but on inspection it is actually a scale coating. I have also noticed black spots appearing at all levels and on the bottom. These appear as a central dark spot and 'smudge' out in 'rays'.

I assume I have hard water calcium coating and black algae but I am totally confused as to how I get rid of them (both) and how I keep them at bay.

Thanks for any help.
:thumbdown:


Poolay

White opaque coating & black spot!

Postby Poolay » Fri 24 Apr, 2009 11:33

The black spots sounds like osmosis. Very unusual to see black spot algae in a fibreglass pool.
grador
Pool Newbie
Pool Newbie
Posts: 2
Joined: Sun 19 Apr, 2009 12:48
My Pool: fibreglass, below ground, 8 x 4, 48,000 ltrs, salt treatment, sand filter.
Location: France

White opaque coating & black spot!

Postby grador » Sat 25 Apr, 2009 14:29

Thanks Poolay for your input. Osmosis is what I have feared most. Do you know how I can identify it and, once it is confirmed, what I must do to repair it?
wboss71
Pool Newbie
Pool Newbie
Posts: 6
Joined: Mon 11 Feb, 2013 19:32
Location: Brisbane

White opaque coating & black spot!

Postby wboss71 » Sat 20 Apr, 2013 03:34

Hello There,

Most fibreglass pools are generally not effected too much by calcium. There are a few products out there that will break down calcium carbonate in swimming pools. www.thepoolstainremovers.com.au talks about this issue and has a few photos on there as well.

I would suggest treating the calcium first before doing anything else about the other marks and spots. Once that calcium film is gone you may be surprised what other problems are solved at the same time.

Just a thought,

Wade

Return to “Hard Pool Water & Scale”

Who is online at the Pool Help Forum

Users browsing this forum: No registered users and 0 guests