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No there is no blue paint at all in the building or pool

I can try that.

Hi James Just so you know here is our new Sodium Hypochlorite just arrived. Switching to this in the next week or so. Waiting on new tank.

Hi Donldson I was not being disrespectful, your combined knowledge makes me look like a complete amateur, I am very happy to take in all your advice and knowledge and learn from it, I have been very frustrated by this and have been on a number of forums without success and have been at my wits...

Yes it is blue

Thanks for all your replies and suggestions. I guess I was hoping for a "I've seen that before and its ............" I will try HCI and see if I can change the type of acid i use and take it from there😏 As soon as I can. I will get back to u all with my findings🙂

Hi James What worries me is that this is the same amount I take out every week. If I had to crush it down to a fine power I would be getting about a cup and a half out every week. Algaecide was added once in November. Cheers Burn

Sorry 120000 Gallons I dont know what tests but if you dont know what it is you can test for toxic materials Thats why I am nonplussed Recommended for the pool size 19 litres Because when I arrived there was black algae in the pool Acid 7.5 Chlorine 2.2

Hi Matt The system is huge (in my opinion) the dosing system is situated in 2 other rooms. 1 acid and 1 chlorine.

No Copper Ionizers Our Algaecide has copper sulphate as an ingredient?

Hi James The pipework is all plastic and the only chemicals we add are the ones above. The pool is lined so some sort of PVC type fabric. Heating is via a stainless steel veined heat exchanger. I cant think of any other parts that could be copper. I do not know what the balance tank is lined...

Hi J The pool is an indoor pool 12000 gallons. This pool is chemically topped up using a dosing system at the moment we are using "Calcium Hypochlorite granules" and "Sodium Hydrogen sulphate granules". The pool runs 2x800 gallon filters, filled with sand, these were relined with Fibre Glass...

Hi All I am new to the forum so please excuse me if I get the etiquette wrong. I look after a pool in a school. Since I have been here I have managed to get the Dolphin pool cleaner working. Every time I take the filters out of the cleaner and rinse them out I am left with a blue residue in the...