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I did not add any algicide. I have a pool company open and close the pool. I don’t think they add anything but will ask them today?

Well I’m really worried now. Put a puck over one of the areas and asorbic acid on another no change on stain. The stain is 1/2 the pool surface. I can’t find when I closed what my numbers were but remember some, ph was 7.2, hardness was 250, free chlorine was 2.

I open pool yesterday and there is a stain all over bottom. I included two pictures maybe someone will have some advice. I’m not sure what it is or what caused it. I tried brushing and nothing comes off. This is my 15 th year opening and first time I’ve had this problem. problem. I did have...

I put it in a clorine puck container that is empty.

Jason, Maybe you can help me. I pulled the cap off the tee and it is a check valve. However water poured out. I closed the valve to the spa return and it stilled poured out. I will lower spa today lower then nozzles and keep the valve closed. I think that will work. However because I have...

Jason, Thanks for your help.

Looked at outside cap and it is a purex pool equipment and I believe it is a check valve. I'm going away for the holidays and will remove cap when I get back. I'm guessing the mechanism is still in there and not working. I have had spa drain down for 10 years and have asked a couple of pool...

That is a tee with a cap going to spa return line. I have never taken the cap off. Maybe it is a check valve and it is broken. I will take it off. Draining back makes sense now that you mentioned it. Thanks I see the check won't work where the two way is now. Not sure what I can do if the...

Here is a picture. Note the two way from heater. I'd like to just take it out and put in a check valve to keep spa full when pump off. If someone has a better place let me know.

I probably did not make myself clear. The three way is for spa or pool return or combination. There is a two way before the three way which I have never used. I always wondered if I closed it how would water get to the returns. Just don't understand why it is there. Would like to remove it...

I'm new to the forum. I have had a pool for 9 years. I open and close it myself. One thing that bothers me about the pool is the spa drains back to the return nozzles on it every evening when pool pump shuts off. Looking at the valve arrangement there is a two way valve inline from the heater...