Strange white crystals coming out of MPV

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Eddles
Pool Care Proficient
Pool Care Proficient
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Joined: Mon 10 Jun, 2019 16:09
My Pool: 66000 litre indoor swimming pool with UV and sand filtration, and 1200 litre hot tub.

Strange white crystals coming out of MPV

Postby Eddles » Mon 28 Oct, 2019 17:37

Hi all,

I've just spotted that there's strange white crystals coming out of the MPV from the backwash connection of the sand filter - looks a bit like salt? What's this? How do I fix this?

Many thanks in advance for advice.

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Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2319
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Strange white crystals coming out of MPV

Postby Denniswiseman » Tue 29 Oct, 2019 07:01

I suspect it is salt (taste it)
Do you use liquid chlorine (plain bleach, sodium hypochlorite) to chlorinate as this adds more salt to the system
When you have a leak the water evaporates and leaves the salt residue behind
Not harmfull just reair the leak

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