Removing metal with flocculant

Stains on the pool surfaces, pool equipment
or on the swimmers, or off-color swimming pool
water. Discolored but clear pool water.
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Removing metal with flocculant

Postby dbdbdb » Tue 24 May, 2022 11:28

I live in the Netherlands and our town's water supply is provided from a ground source. It contains unusually visible amounts of metal straight from the tap which makes even taking a bath unpleasant. :sick:

This is my third year of managing this amount of metal in a pool. I've read countless threads on how others manage metal. It can take a week or two of constant filtering with both the sand filter and polyfill (in the skimmers) to get enough of the oxidised metal out the pool to restore it to blue. Sequestrant seems to be a bit hit and miss and expensive. Performing a SLAM is impossible without causing more oxidation.

Last weeked I added a gallon of chlorine after topping up the pool with fresh water. Within ten minutes the chlorine had oxidised the metal and the pool had the tell-tale green tinge. Clearing the pool was an emergency as we had a couple of parties planned this week (public holiday in Netherlands) and I had no time to filter the pool clear. :evil:

So after some reading (and experimenting) I decided to floc the pool for the first time. I've never used floc before and didn't know whether it would work for oxidised metal. However at this point I was desparate, so it was worth a shot.

The results were immediate and amazing. Within thirty minutes of adding the floc, whilst it was still mixing (multiport valve on recirculate), I could already see oxidised metal dropping to the botton of the pool :shock: . Once mixed, I switched off the pump and left overnight. After vacuuming to waste this morning my water is perfectly blue and crystal clear!

I know that floc is sometimes frowned upon. However in my circumstances, with limited time to fix the pool, it did a great job and will now be part of my armoury against metals in the future.

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Re: Removing metal with flocculant

Postby Teapot1 » Tue 24 May, 2022 13:35

Just to be clear (pun intended) I am in favour of flocculent! Which one did you use? As there are anionic and cationic flocculents some attracts negative particles the other positive particles as you have metals you would normally select a negative one (anionic) to attract the positive metals.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.

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