Hi all,
Bought a house with a pool last year and this forum has been very helpful. This year decided I would invest in a SWG and attempt to drop the CYA to get things in line with the recommendations on this forum. Thank you in advance for your help.
1. We have a plaster pool that apparently lifted 1-2 times with the prior owners during a drain. To mitigate some risk I had a professional lower the pool ~2 feet 2x last week to lower the CYA. Pool is fine but it looks like CYA is still high. I did the CYA test multiple times at 50% / 50% dilution (fresh / pool) and 100% (pool). I'm struggling a bit to determine exactly just when the dot "just" disappears but I believe it's around 120 (definitely over 100). To avoid another partial drain and refill, could I work with this CYA and hope it slowly lowers over the season with backwashes / rain? If I need to maintain a FC of 4.5% of the CYA (SW pool), I'm hoping the SWG should be able to produce a FC of 5-7, which should be sufficient. We have a 40k Hayward cell for a 25k pool. I can occasionally add chlorine as needed as to not set my SWG % too high but I do not know if this is unreasonable since it's new.
2. What are the risks of using dry acid? I have chemical sensitivities and was really hoping to use dry acid. What is the best way to add this to a plaster pool (dilute first, direct into deep end, etc.)?
3. What is the correct order to address my low TA / high PH? Do I address the TA first and then wait a few hours before lowering the PH?
4. Given my CH is low, could I continue to use calcium hypochlorite on occasion if needed if the FC drops too low?
CC or TC - 0
pH - 8
TA - 70
CH - 170
CYA - 120
Bought a house with a pool last year and this forum has been very helpful. This year decided I would invest in a SWG and attempt to drop the CYA to get things in line with the recommendations on this forum. Thank you in advance for your help.
1. We have a plaster pool that apparently lifted 1-2 times with the prior owners during a drain. To mitigate some risk I had a professional lower the pool ~2 feet 2x last week to lower the CYA. Pool is fine but it looks like CYA is still high. I did the CYA test multiple times at 50% / 50% dilution (fresh / pool) and 100% (pool). I'm struggling a bit to determine exactly just when the dot "just" disappears but I believe it's around 120 (definitely over 100). To avoid another partial drain and refill, could I work with this CYA and hope it slowly lowers over the season with backwashes / rain? If I need to maintain a FC of 4.5% of the CYA (SW pool), I'm hoping the SWG should be able to produce a FC of 5-7, which should be sufficient. We have a 40k Hayward cell for a 25k pool. I can occasionally add chlorine as needed as to not set my SWG % too high but I do not know if this is unreasonable since it's new.
2. What are the risks of using dry acid? I have chemical sensitivities and was really hoping to use dry acid. What is the best way to add this to a plaster pool (dilute first, direct into deep end, etc.)?
3. What is the correct order to address my low TA / high PH? Do I address the TA first and then wait a few hours before lowering the PH?
4. Given my CH is low, could I continue to use calcium hypochlorite on occasion if needed if the FC drops too low?
- The size of your pool in gallons ~25k
- If your pool is an AG (above ground) or IG (in ground) - IG
- If it's IG, tell us if it's vinyl, plaster/pebble, or fiberglass - Gunite (plaster)
- The type filter you have (sand, DE, cartridge) -Sand
- List any other equipment you have: SWG, second pump, etc. - Recently installed SWG
- List what test kit you use to test your water - K2006
- Location - NJ
CC or TC - 0
pH - 8
TA - 70
CH - 170
CYA - 120