Pool store test recommendations seem extreme 7 pounds of dry acid?

chamburger1

New member
Jul 28, 2024
2
Southeast Pennsylvania
Pool Size
4000
Surface
Vinyl
Hi new guy in town here looking for advice.

After few weeks of land prep and set up, I finally filled to about 38". Water seemed clean still I shocked and popped a floater with a 3 inch puck. I tested the water using Clorox test strips and the PH and alk seemed high but chlorine TC and FC looked good. Water is clear and not cloudy.

Haven't swam in it yet but been testing with strips daily and vacuuming and skimming. Just keeping debris out as much as I can. It's not big so takes only a few minutes. Today I tested and noticed the FC and TC were low to 0. Made me think to actually have water tested at my local pool store, Leslie's. Their numbers pretty much matched with the test strips though they were a lot more fine tuned measurements.

They recommended dry acid to lower the pH from 7.8 to 7.5 and the all from 183 to 100. Based on my pool size and capacity with the current measurements of the test they recommended 7 pounds of dry acid.

That seemed high to me so I read before leaving the store and people were pretty split on muriatic acid vs dry acid, really only saying dry has sulfur byproduct bonding with calcium to form gypsum where as MA is a bit more risky to handle. Figured I'd go for the dry acid since I don't have a calcium problem.

Pool store guy said I could do the whole 7 pounds at once but I dk still seemed high so I started with around 4 dry cups in a bucket. Mixed dissolved and then poured in. Filter is running for last 4 hours. Probably leave on for another 3.

I didn't think to do it earlier but I used a pool math calc and it recommended 7.5 ounces of dry acid. Did I use too much? Conflicted since pool store said 7 pounds and math app said 7.5 oz. Luckily I didn't fill cups full more of a scoop than a full cup so probably closer to 3 cups.
 
Welcome to the forum!
You need a proper test kit. I suggest the TF-100/Pro or Taylor K2006C. A proper test kit is needed to get the accurate water chemistry results needed to follow the TFP protocols.
You added way too much dry acid. Do not add any more. Luckily, if your TA is where they read it to be, the pH should rebound.
I would never return to that pool store. They are not very smart.
I suggest you read through Pool Care Basics - Trouble Free Pool and even look at a few of our videos TFP-TV - Trouble Free Pool
 
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What MK said. Get a test kit. I've been to the big named store and also used their at home test. Compared against my Taylor, there are consistent inaccuracies. It'll tell me to add 560 pounds of salt when it only needed one bag. Tells me to add 40 pounds of a product to increase calcium hardness. Well, CH is perfectly in range. The only proper test is the one you do yourself. It may be intimidating at first but it gets very easy.
 
Thanks all.

I'm waiting for my Taylor kit from amz but the test strips I have show ph and alk decreased and I think it freed up some chlorine bc those are now in middle of reading.

I don't understand how they could recommend 7 pounds of dry acid when online calcs recommended 7 ounces.

Seems way off. Either way I'm returning this big tub if dry acid and their test kit.
 
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