Intex Easy Set Round 15' x 36" 2,800 Gallons above-ground vinyl pool, Intex Krystal Clear Sand Filter Model FS70110 with GFCI, and a pump flow rate of 2,800 gallons per hour. Clorox Pool&Spa 25-lb Sand Pool Plus. Shock = 8oz hth Ultra once a week. Sanitizer= hth Ultra 3" Chlorinating Tablets in Floating Chlorine Dispenser. Manual vacuuming using Weighted Triangle Swimming Pool Vacuum Cleaner Head Attachment.
It is generally much easier to just use PoolMath to make the calculations for you.
According to it, 70 pounds would add about 3000ppm of salt.
Jason, TFP Moderator
18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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As mentioned use Pool Math. I would suggest you go easy on the salt. You could always add more if needed. Too much and you will be draining the pool.
20X36 IG vinyl (18,000 gal), 3 sheer descents, Max-Flo 1.5hp VS 2300, Aquarite T15 SWG, C3030 filter, 250,000 BTU heater, Sharkvac XL (Hayward equip)