Water Chemistry Pool Repair Q&A

Water Chemistry Medium 2-4 days for complete dissolution 1,244 👍 2

How to Dissolve Pool Stabilizer (CYA) - Complete Guide

Around $800 worth of granular cyanuric acid is just sitting on my pool bottom — would my warranty cover this stabilizer dissolution mess before I drain 20,000 gallons? I have a 20,000 gallon inground pool and my current CYA reading is around 15 ppm - I need to get it up to about 50 ppm. I tried just broadcasting the granules directly into the pool like I do with other chemicals, but they seem to just sink to the bottom and sit there without dissolving much.

I've heard that cyanuric acid is notoriously slow to dissolve compared to other pool chemicals. What's the most effective method to get this stuff into solution? Should I be pre-dissolving it somehow, or is there a specific technique that works better? I want to make sure I'm doing this right and not wasting product or creating hot spots in my pool.…more

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Water Chemistry Easy 10 minutes 602 👍 0

How Long Do Pool Chemicals Last? Complete Shelf Life Guide

Somewhere in my garage I've got old pool chemicals from last season, but I can't afford to replace them all — is there a way to test if they're still good for under $20?

Specifically looking for technical specifications on how long liquid chlorine maintains potency versus granular forms, and whether chemicals like sodium bicarbonate and muriatic acid have definitive expiration parameters. Storage conditions are controlled temperature and humidity, so assuming optimal preservation environment.…more

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Water Chemistry Medium 2-3 days 498 👍 0

How to Fix Pool Stabilizer Level: Complete CYA Guide

Nobody warned me I'd walk out this morning to find my pool showing a 28 ppm CYA reading that has me completely baffled about what to do next.

For low stabilizer situations, what's the exact amount of cyanuric acid needed per gallon of pool water to achieve specific ppm increases? Additionally, I've read that high CYA levels present different challenges - what are the recommended approaches when levels exceed acceptable thresholds? I need reliable technical guidance for both scenarios to maintain proper water chemistry balance.…more

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4.5 (18,700 reviews)

Water Chemistry Easy 30 minutes 433 👍 0

Can You Shock Pool After Adding Muriatic Acid? Safe Timing

Our 2019 Intex Easy Set just got muriatic acid to lower the pH but now we're wondering if we can shock it right away. I added some muriatic acid to my pool yesterday to bring down the pH (it was reading around 8.2). Now I'm wondering if I can go ahead and shock the pool today or if I need to wait? I don't want to create any dangerous chemical reactions or damage anything. The pool store guy mentioned something about waiting between chemicals but I can't remember exactly what he said. Should I test the water first or just wait a certain amount of time? Thanks for any help - still learning all this pool chemistry stuff!…more

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Water Chemistry Easy 30 minutes 360 👍 0

Do Pool Chlorine Tablets Expire? Complete Shelf Life Guide

Walked into the garage yesterday and my wife called out my "chlorine tablet graveyard" from 2022, making me wonder if those old tablets are even safe to use.

The pool store guy keeps telling me I need fresh chemicals every year, but that seems like a money grab. How long do these tablets actually last, and how can I tell if mine have gone bad? I'm trying to save money by buying in bulk and storing extras, but I don't want to use something that could be dangerous or just won't work properly.…more

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Water Chemistry Easy 15 minutes 358 👍 0

Can I Use Pool Chlorine Tablets in My Toilet? Safety Guide

Standing in my garage with a bucket of leftover trichlor tablets from last season and wondering if these can pull double duty as toilet bowl cleaners. My thinking is that chlorine is chlorine, right? I've seen those blue toilet bowl tablets that slowly dissolve and keep things clean, so I figured maybe I could just drop one of my 3-inch pool tablets in the tank to do the same thing.

Before I try this, I want to make sure it's actually safe for my plumbing and won't cause any problems. Are pool chlorine tablets too strong for toilet use? I don't want to damage my pipes or create any health hazards, but it seems like it could be a good way to use up these extra tablets instead of letting them go to waste.…more

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Water Chemistry Medium 6-8 hours 319 👍 0

Can I Shock Pool After Adding Alkalinity? Timing Guide

Walked out to check my 20,000 gallon inground pool after dosing it with sodium bicarbonate this morning to raise alkalinity from 60 ppm to 100 ppm, and now I'm second-guessing my shocking timeline. My pH was sitting at about 7.2 before I added the alkalinity increaser, but I know adding baking soda can bump up the pH as well.

I'm planning to shock the pool tonight since we've had some heavy swimmer load this week and the water is starting to look a bit cloudy. Should I wait a certain amount of time after adding the alkalinity before I shock? I want to make sure the shock is as effective as possible and I've heard that pH levels can affect how well chlorine works.

My current test results show chlorine at 1.5 ppm, alkalinity should now be around 100 ppm, and I'm not sure what the pH has risen to after adding the sodium bicarbonate earlier today.…more

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Water Chemistry Medium 45 minutes 313 👍 0

Do Fiberglass Pools Need Calcium Hardness? Complete Guide

Pool builder says my new fiberglass shell doesn't need calcium hardness adjustments like a plaster pool does. But the water test shows 150 ppm and the internet says that's too low for any pool. Who's right here — does fiberglass actually need calcium or not?…more

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Water Chemistry Medium 2-4 hours 302 👍 0

Do Vinyl Pools Need Calcium? Complete CH Guide 2024

Before our big pool party this Saturday, I'm getting completely contradictory advice about whether my vinyl pool even needs calcium added! I keep reading conflicting info online - some sources say vinyl pools don't need calcium at all, others say they do but at different levels than concrete pools. My test strips show I'm sitting around 100 ppm right now and I'm not sure if that's too low or if I even need to worry about it.

I've been dealing with some metal staining on my vinyl liner and wondering if low calcium could be making it worse by causing corrosion. But I'm also terrified of adding too much and ending up with scaling or that dreaded cloudy water that takes forever to clear up. What's the sweet spot for calcium hardness in vinyl pools, and is it really different from other pool types?…more

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Water Chemistry Easy 30 minutes 296 👍 0

Can I Add Pool Chemicals at the Same Time? Safe Mixing Guide

Spent all week prepping for Saturday's pool party and now I'm scrambling to balance the water but wondering if I can add multiple chemicals together to save time.
The pool store gave me a bunch of different chemicals but didn't really explain the timing. I want to make sure I'm not going to create some dangerous reaction or mess up my water chemistry. Should I be spacing these out somehow?…more

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Water Chemistry Easy 15 minutes 287 👍 0

Do I Need pH Up and Down for Pool? Essential pH Guide

My husband casually mentioned that we're the only neighbors who stock both pH Up AND pH Down, and now I'm suspicious the pool store is playing us. That's like $40-50 just for pH adjustment chemicals alone!

Is this just upselling, or do I actually need to keep both products on hand? My pool seems to drift one way or the other pH-wise, but rarely both directions. Looking for some honest advice from people who aren't trying to empty my wallet every time I walk in for supplies.…more

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4.6 (45,200 reviews)

Water Chemistry Medium 2-3 days 285 👍 0

How to Raise Pool Stabilizer (CYA) Levels - Complete Guide

Already tried three different YouTube tutorials to raise my pool's CYA levels but somehow made them even lower than before. Pool is about 10,000 gallons. What's the right amount of cyanuric acid to add and what's the best method? Granular or liquid stabilizer?…more

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Water Chemistry Medium 45 minutes 282 👍 0

Can Pool Chlorine Clean Concrete? Safe Methods & Alternatives

Between the humidity and recent rain, my concrete pool deck started showing these nasty green algae stains last week and now I'm wondering if pool chlorine can clean them off. My concrete pool deck is absolutely filthy with algae stains and dirt buildup, and nothing seems to work. I've scrubbed until my arms hurt and tried different cleaners, but these green stains just won't budge.

I have tons of pool chlorine sitting around and I'm wondering if I can use that to blast these concrete stains away? I don't want to damage the surface or create some kind of chemical disaster, but I'm running out of options. If chlorine works, what's the right way to dilute it? And honestly, are there better alternatives that might actually get this mess clean without all the guesswork?…more

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Water Chemistry Easy 30 minutes 279 👍 0

How Long to Wait Before Swimming After Pool Chemicals

Apparently I'm standing in my garage staring at three different pool chemicals I added this morning with no clue how long I actually need to wait before diving in. Yesterday I added liquid chlorine to bring my levels up from 1.2 ppm to around 3.0 ppm, and I wasn't sure if we could swim that evening or needed to wait until the next day.

I'm planning to shock the pool this weekend with calcium hypochlorite since we've had some cloudy water issues, and I also need to adjust the pH which has been running high at 7.8. The kids are eager to get back in the pool, but I want to make sure I'm following proper safety guidelines. Do different chemicals have different waiting periods, and should I always test the water first regardless of how much time has passed?…more

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Water Chemistry Medium 4-6 hours 273 👍 0

Can I Shock Pool After Adding Baking Soda? Complete Guide

Noticed my neighbor's pool stays crystal clear when he adds baking soda then shocks immediately, but mine turns cloudy every time — what's his secret? I added baking soda to raise my alkalinity this morning, but now I'm wondering about timing.

Can I go ahead and shock the pool right away, or do I need to wait? I don't want to waste the shock treatment or mess up my water chemistry. The pool store guy mentioned something about waiting but then tried to upsell me on their "premium" shock system. Just looking for straight answers on proper timing and whether I should test anything specific before shocking.…more

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