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This is a builders warranty issue. Don't muck about with it. Report it to him till its fixed.

Sure would be I am certain. But how many times would it be come across? If chlorine clears it the assumption would be it is organics of some sort likely algae, but could be something else. Organic chemistry is too hard to work out to know for sure. I forgot to mention...blue pool slight...

Not wanting to belabour the point, the water may appear clear in small amounts even a bath may not look off colour but the actual colour shows up ina larger water body like the pool perhaps.

How are you testing? When you say hardness at a good level what is that level? A few days is a week or three? Has the spa been used?

First guess would be iron. It reacts with chlorine to create a green colour for a day or so. However the lab returned 0. Is that ferrous or ferric iron at 0? Could it just be the well water is green after treatment and the chlorine needs time to work? The 12 hours is simply turnover and...

Where is the iron coming from? Do you happen to know what form it is?

I would try reticulation shop or farm supplies perhaps. Yes that's it

Classic blower too large issue. What happens is the blower is sending too much air to the jet, instead of 'jetting' the air overwhelms the jet and comes out in great clumps thinking of it as kind of burping. The air rises up next to wall and water overflows. Slowing the air down is the only...

First off I suggest finding a store that sells a sticker for the top of the multiport it will save you a lot of guessing. Looking at the valve the position the handle is in, from the photo looks like filter. This is the normal run position. 180 degrees from this is backwash. So to backwash...

I think it depends on country. From my personal observations having worked across numerous countries, commonwealth countries as a general rule have an enforceable health regulatory framework applying to these facilities. This seems to be missing in the non commonwealth countries.

The tablets are isocyanuric based chlorine one with floc in the other without. There is no discernible difference between the two products. The tablets are lowering the pH of the pool. They have too. Its part of their chemistry, and are not pH stabilised. Something else not that it...

Not sure about Lowes. The fitting you want we call a 2 inch hose tail. Here they are made from Poly but could be PVC. POLY BSP TAIL

Try a different test kit. The Aquacheck is a strip reader and test strips are notoriously unreliable.

Best guess is given its age it is/was a hydrostatic valve. When I started in the industry we fitted them often and often capped them off to prevent leaking pools. I would guess this is what you may have.

This is because the blower is connected to the venturi pipe on the jet. The pump runs and isn't pulling enough vacuum to clear the water from the venturi pipe, the blower is turned on and pushes the water clear of venturi pipe as long as venturi pipe remains clear the pump will now jet properly.

I am sorry, I would insist the pool is replastered completely. A waterproof plaster mix is 4 parts sand 2 parts cement. Keep damp for several weeks after completion and this plaster is both water tight and rock hard without any additives. Adding additives may make it more water tight I...

That makes sense with my understanding

I am not 100% certain however this looks similar to an issue we get in a quart finish. The actual cause is the coating has partially dried out and still been being worked (here). These are very mild compared to the ones we see. Easiest is to live with them.

How old is the pump?

At the levels you are running the chlorine at there is nothing lurking anywhere unless you have some weird chlorine resistant bug with superpowers from what I can see at the levels you are running I think without checking you're exceeding the CT on cryptosporidium.

Re: Dirty water in return jets Is this a new installation? When did the issue start? Can we get photos of the equipment set up? Does this happen all the time or only under some settings? If you started up in backwash and then rinse then went to Filter does this still happen? Have you got...

It is possible to change blower air output. Its just not normal. Simplest way for domestic would be to fit 3 way valve to the discharge of the blower then position the valve to vent some air off to atmosphere. Air acts different to water, however for the exercise think of it like water...

How long have these spots been there? Since new? Or was the pool emptied to help with landscaping?

Picture please

Please check something for me... Previously I had a pool...a bit bigger than yours, behaving similar and the council was blaming the filter and about to invest a few hundred thousand in some new plant. I went to site and had a look about and found a minor leak on the suction side of the...

This reads as the chlorine being fine and no excessive consumption of chlorine evident from the CC differences. I think write this off as contamination and wait for next rain event, don't react and see if a change occurs then update with more data.

Alternative maybe to live with the TA and raise CH to balance out

Sack that pool store.

Check something for me... Turn pump on wait an hour or so water starts to look hazy/cloudy Turn pump off wait a few minuets and the water looks clear Is that correct?

In case it is in the filter try backwashing a few times in a row for a couple of nights. This will also reduce the cyanuric a bit.