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I have a concrete pool. Is it safe to add granular chlorine (70% cal-hypo) after it's been closed and is it a must that I circulate the water with a sub. pump? This year I closed early and I want to top up my FC ahead of winter but don't want to keep a partial jug of liquid chlorine in the...

Test images: https://imgur.com/a/RxFtdwt

I closed my pool about 4 weeks ago trying the air-lock method. I used a blow-through expansion valve in my skimmer. Pretty sure I was successful as I heard / saw nothing that would indicate a leaky seal. Today I decided to check the skimmer and it was full of water - the expansion plug had...

THANK YOU to all mods and members who answer so many questions every day - including mine - and helped me take control of my pool. Just finished my first SLAM and am shocked by the great results (pun intended). FC: 28 CC: 0 CYA: 60 PH: 7.5 TA: 110 CH: 220 This 40-year old pool has never been...

I'm SLAMmin' using the Taylor K-2006C for the first time. Basically my question is, how colorless does the water need to be to complete the FC and CC tests? During the FC test the water turns clear for a few seconds after adding around 30 drops but turns near-transparent pink again. When I...

I'm getting ready for my first closing, there are a few things I'm unsure of: I believe my pool is marbelite, have heard this surface is meant to remain submerged. Do I need to raise the water level after closing or will safety cover run-off handle this over the closure period? Previous...

Can someone please explain how they have successfully used a skimmer sock? My experience so far has not been great, there have been many cases of air bubbles coming back into the skimmer and upturning the sock & contents. Can they be used during vacuuming, specifically with an automated vac...

Hi all, just took over a gunite pool which seems rare in my location and hoping to tap into the broader TFP expertise. My IG pool has one skimmer - Hayward SP-1080 series I think. There are two pipes in the bottom of the skimmer - I believe that one pulls from the bottom drain and the other...