Getting 16fc loss over 24hrs

[qwertyjjj]

Ever since I put the filter in, I'm getting severe FC loss on sunny days (probably the small pool gets more bleaching?)
I shocked to 16fc, cya=40
The next even it was back down at 0.2fc, TC 0.57

Should I be adding chlorine twice a day for a pool this size and is it worth increasing cya more?

 

[PoolGate]

What is KYC? I suggest you get a proper test kit like the TF-100 (links above) and do a full set of tests. Also your pool is small enough to be considered a seasonal pool so you might look to that section on this forum.

Pool School - Guide for Seasonal/Temporary Pools

 

[Deb04]

I think you probably mean CYA. That’s a big chlorine loss. You need to slam your pool and, to do that, you need a good test kit, TF-100 or K2006c.

 

[qwertyjjj]

I raised to 16. That was slamming it
I have a dpd kit.
Should I test again this morning?

 

[mknauss]

SLAM Process. Please read the article.

You Maintain 16 ppm FC. Test FC (using the FAS-DPD test, powder followed by liquid reagent) every couple hours. Add liquid chlorine to get back to 16 ppm FC using PoolMath

 

[JimMarshall]

During the early stages of a SLAM Process if you’re free and able to do so, it’s not unreasonable to test and re-dose every 30 minutes even.

 

[PoolGate]

Are your numbers right in your sig line? 400 gallons and another 3400 gallon? If correct and was me, I would just empty and start over.

 

[qwertyjjj]

Are your numbers right in your sig line? 400 gallons and another 3400 gallon? If correct and was me, I would just empty and start over.

Yeah I have to drain to the nearest drain in the alley and connect up the sump. it's quicker to add chlorine and maintain

 

[qwertyjjj]

Are your numbers right in your sig line? 400 gallons and another 3400 gallon? If correct and was me, I would just empty and start over.

Yeah I have to drain to the nearest drain in the alley and connect up the sump. it's quicker to add chlorine and maintain

 

[qwertyjjj]

By the way, as cya gets higher you have to add more chlorine to be effective. Does this mean the safe level of chlorine to swim in goes up as well? If not, why does it stay consistent at a safe level of 10 or below. Is it because total chlorine is just as irritant to skin with or without cya?

 

[mknauss]

You can safely swim in a pool as long as the FC is above the minimum and at or below SLAM level based on your CYA. You must also be able to see the bottom of the pool in the deep end of the pool.

 

[qwertyjjj]

Do you think shallow pools have their chlorine bleached and evaporated quicker then a deep big pool? Wondering if that's why my FC is disappearing so quickly. The water's clear so seems unlikely to be bacteria or algae.

 

[Wulfdan]

Temperature, more of the water catching UV. If you push to 60 CYA it should help. I’d do an OCLT first though