Count your cya as 30 so slam fc level is 12ppm.
FC/CYA Levels
Use liquid chlorine. Buy about 10 gallons to start- as u will go through alot at 1st.
Lower ph to 7.2 before beginning.
For a successful SLAM Process
you need to continue to MAINTAIN Slam level fc for your cya until you meet ALL 3 end of slam criteria-
You are done when:
CC is 0.5 or lower;
You pass an Overnight Chlorine Loss Test
AND
the water is clear.
(Crystal Clear w/no algae dead or alive)
*Check & scrub every nook & cranny where algae may hide (light niches, steps, drain covers, ladder handrails, skimmer throats/weirs, etc.)
*Run slam level water through all water features & lines for at least a couple hours a day during the
SLAM Process.
*Brush & or vac daily (this breaks up biofilms that algae uses to protect itself from chlorine)
*Backwash/clean filter when pressure rises 25%over clean pressure.
As far as a swg goes…
You have a large pool so u need a swg rated for 60k gallons - since one rated for at least 2x’s your pool volume is recommended.
Circupool & pentair have units that large.
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