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    When to replace the Mastic?

    Hello, I am wondering when it becomes time to replace the mastic / Deck-o-Seal that serves as the expansion joint between my decking and coping. Here are a few photos... is it time to replace it?? Pools is 8 years old... all thoughts appreciated.
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    How do I cut off my Auto Fill? Doesn't cut off water at the backfill...

    Hello, I attempted to turn off the AutoFill today to trouble shoot another issue. Wasn't sure how to do that but watched a video or two and it all seemed to be at the backfill so I cut those off by turning the valves perpendicular (the photo below only has one perpendicular but I tried with...
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    Continuously Wet Spot where Deck meets House Wall

    I have a "spot" where the decking meets the wall of my house that is always wet despite us having no rain for quite awhile and us not using the hose in that area for a long time. It is circled in the attached photos in ORANGE. The first photo also has a number of items near it circled in...
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    By-passing High Limit Switch on Pentair MasterTemp 400 Heater

    After reading several older but always helpful TFP posts, I was able to trouble shoot my MasterTemp 400 heater. I jumped / bypassed the High Limit Switch and the heater now works perfectly again. I did this only for diagnostic purposes and am not using the heater this way. My question is...
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    Heater Cycling Before Reaching Set point temp

    Moved from here... Heater Cycling Before Reaching Set Temperature I believe that I am having a similar problem with the air in my line causing my heater to cycle. This only happens in spa mode, not in pool mode for the equipment set-up. I can see the air coming out of the jets in my spa when...
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    Replacing Pentair LED light... few questions

    My Pentair LED light was not working this weekend. So, I first ensured that electricity was flowing as far as I could outside the pool and that all appeared to be fine. Next, I cut the breaker and pulled the light out of the water. Turned breaker back on and electricity is definitely flowing...
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    Pentair Master Temp 400 Thermal Regulator Question- before I screw it up...

    Team TFP, So, I read a number of threads about the Master Temp 400 cycling above a certain temperature- which is the problem that I am having. So, I attempted to remove the Thermal Regulator and see if it looked bad or reach in and see if the bypass was bad. First error- apparently, i do not...
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    Odd black, RAISED spots on sunshelf plaster in pool

    I having being using TFP for quite some time and have never seen this and I searched around but could not see anything related... thus, the new post. The sunshelf on my SWG pool is 9" deep and the spa waterfall does overflow onto it. Recently, I have found ~10 black, RAISED spots on the...
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    How to lower very high FC after successful slam?

    I performed a successful SLAM of my SWG pool w/ CYA of 70 at the time which required FC of 28. Met all SLAM requirements and have not added any chlorine in 4 days and SWG is off. Current readings (k-2006) from this morning but unsure of reliability of #s given such high FC from SLAM: FC: 25.5...
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    SLAM but lingering smell in one skimmer and backswimmers

    My pool is crystal clear with no visible issues. I had a "fishy smell" in one skimmer though and saw one backswimmer in the pool, which I killed. So, I slammed the pool... taking FC to 28 for several days. Post my successful SLAM, the FC has remained in the 20s after 2 days and the smell is...
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    Tile stain that does not react to acid or ever really go away...

    See the photo but I have one white stain on my blue tile on the tile wall of the waterfall. It is about two feet away from waterfall and one foot above pool water level. I get evaporate buildup around the waterfall but that reacts to the acid and can be cleaned with a water /acid mix. This new...
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    Efflorescence v. Calcium build up??

    I have an elevated spa that overflows into the pool via a waterfall. The 6" tiles on the face of the waterfall continue to get a white build up. at first, I thought it was calcium build up but my chems are all in balance and I don't get any build up anywhere else. That is when I read about...
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    Need help before adding SO MUCH chemical

    Many thanks to all who post on here as I have read so much that has been useful over the years. I just fired the person who had been cleaning my pool for the last year after checking a few things and realizing my pool is WAY out of balance. It is a saltwater pool. My Taylor kit says: FC: 0 (I...