I am battling green algae and am preparing to SLAM. I just bought a FAS-DPD test kit, my PH is at 7.2 but my CYA is 100. The chlorine CYA chart says that slam is not recommend if the CYA is over 70. Question: Do I keep draining the pool to try and lower the CYA (and keep adding muricate acid to maintain the PH level) or go ahead and raise the FC (currently at 7) to the recommend levels with the CYA this high? What should I do? 20,000 gal gunite pool in south Texas. Hard water, high PH. lots of sun. thank you.
Help with SLAM
- Thread starter DPR
- Start date
- Jun 22, 2014
- 47,949
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
I would continue to exchange a bit more water to lower the CYA first. Try to get the CYA down to at least 70 if you can.
thank you. When I drain water should I continue to add muriatic acid to maintain the pH? (When I add water PH increases).
- Jun 22, 2014
- 47,949
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
No need. Don't waste time and chemicals. Focus on the CYA first. Once you are sure it's below 100, somewhere in that 70 range, then you can test/adjust the pH in preparation for the SLAM Process. If you only get the CYA down to 80 it's okay, it just means a higher FC SLAM level (31) versus the FC level of 28 for a CYA of 70.
reggiehammond
Gold Supporter
- Oct 4, 2020
- 1,546
- Pool Size
- 30000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
You might take this opportunity to knock the CYA down to 30-40 to make it easier. This is the time of year when liquid chlorine starts to get hit and miss.
At 70 CYA - you're going to need to buy out the stock of Home Depot, basically.
Might just want to take your lumps and head down to 30... Also consider moving to SWCG. A weekly pool service will get you right back into this mess in just a few short months.
Use that pool water to water the grass and trees!
At 70 CYA - you're going to need to buy out the stock of Home Depot, basically.
Might just want to take your lumps and head down to 30... Also consider moving to SWCG. A weekly pool service will get you right back into this mess in just a few short months.
Use that pool water to water the grass and trees!
I was in the same situation as you are a month ago, also a new pool owner. My CYA was 110 and I tried doing the SLAM and I regret it so much. I literally dumped 32 gallons of chlorine in it before realizing how impossible it was going to be to keep the SLAM level up for that CYA. I went to Harbor Freight, bought a $65 sump pump and went to town draining it and SLAM became so much more easy.
So I HIGHLY recommend draining it first.
Thank you, I think that is sound advice. I have been draining the pool the last few days and replacing the water with softened water from the house. CYA down to 80, will keep on draining.
reggiehammond
Gold Supporter
- Oct 4, 2020
- 1,546
- Pool Size
- 30000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
Salt Water Chlorine Generators
Salt Water Generators are designed to produce small amounts of chlorine continuously. This is perfect for day to day use and reduces work for the homeowner.
www.troublefreepool.com
thank you - should have figured that out on my own, feeling dumb today.Salt Water Chlorine Generators
Salt Water Generators are designed to produce small amounts of chlorine continuously. This is perfect for day to day use and reduces work for the homeowner.