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I ordered some dry acid and did the sock test. The small brown dots were not affected by the acid however the thick rim seemed to get lighter after I rubbed it.

For reference, this thread was my last stain thread and it ended up being iron staining. I took a snorkel and a sock full of crushed vitamin C tablets and sorted it out, thanks for the contributions there team...

Thanks for all your contributions. I ended up hitting the stain with a sock full of vitamin C and it took care of it all. Thanks also for the tips on testing and the difference between liquid chlorine and bleach. I think I need to upgrade my testing kit equipment if I am going to be testing that...

In Aus you have to have an MSDS with all chemicals. For this product the composition is... Magnesium chloride, hexadyrate: >95% Ingredients determined to be Non hazardous: Balance Maybe the <5% "balance" has some iron in it? Anyway, thanks for weighing in, I'll treat it as excess iron in the...

I test myself using the Total Pool Test Kit from CCL. Been using that kit since I got the pool so am getting reasonably good at using it, I think. (I did 1st year chem at uni if that counts for anything). I don't have time to test more often as I am renovating the house. I'll try to go to...

You're right, it recommends salt. I was hoping that it didn't really matter what type of salt. Not exactly at the same time, they were all each about 15 mins apart as needed to prep the next thing and waited for the previous to dissolve. The reviews on the site that I got the Magnesium from...

Been managing my pool succesfully since I inherited it 6 months ago. Fibreglass, 50,000L, SWG salt water with sand filter. Last weekend I did my monthly tests and got these results: Free chlorine: 1.5 Combined chlorine: 0 pH: 7.5 Total alkalinity: 60 Calcium hardness: 225 CYA: 100 Salt: 4700...

Update to close this out. I installed a check valve (one-way) just after the pool chlorinator and this has solved the problem. Now I can run my solar pump and filter pump at the same time or individually and it works fine. I ended up contacting Acson who manufacture the MS3D controller who put...

Thanks for the advice yblaser. A check valve would make sense so I will get one installed after the chlorinator to stop the back flow from the returns. There is a drilled hole in the PVC pipe that leads into the solar pump and the sensor sticks in there. You are correct that it would only get...

No worries, thanks anyway!

Solar pump is run by an Acson MS3D controller. It looks at the roof temp, pool temp and desired temp and makes a decision on whether to turn the pump on or not. The solar pump is plugged into the MS3D solar controller for power. The controller turns the solar pump on and off according to...

If the solar pump runs according to temperature differences and the filter pump runs on a time schedule, how do I ensure scenario 2 never happens?

Hi, Just purchased a house and inherited a pool. Been using the Pool Math app with great success. The solar pump was not working as there was a PPP error code (Acson controller) and after replacing the pool sensor, it's all good. Issue is I can't seem to work out how it was all set up and I...