Why so many people find it so hard to calculate basic additives that they they all ask the same question, sometimes without key details so potential respondents can't help them anyway?
First - what's "Shock & Swim"? It's no good quoting trade-names because anyone unfamiliar with it won't know its specific dose rate.
Second - what do you mean, 15x42 "Easy Set" pool" Again, that's only any help to a fellow owner of the same pool. You should quote the water depth, or depths if it has deep & shallow ends, width & length, AND whether that's feet or metres. (I suspect feet here as 42m makes a very long pool for a private garden!
1) If you don't already know it, calculate the water volume in EITHER cubic feet OR cubic metres. That is basic school text-book or engineers'-handbook geometry.
If using cu ft then multiply by the appropriate factor for US or UK Gallons.
If using cu m then x by 1000 to obtain the litres. (1 cubic metre of water = 1000 litres)
DO NOT MIX ft & galls with m & l.
2 ) Establish the existing concentration hence additive qty needed, by dip-strip or meter.
3) Now read the label on the disinfectant container or leaflet to establish the dose per so-many galls or litres.
4) Divide your pool's volume to find that "so-many" factor then multiply the dose rate by that, & adjust the answer to suit the existing concentration. .
E.g. if your pool holds 50 000 litres & the instruction say "1kg of granules per 10 000 litres for 2ppm" then it's (50000 / 10000) x 1kg = 5kg for 2ppm rise.
So if there are already 1ppm of bleach in the water, you need add only half that, i.e. 2.5kg, to give a new concentration of 2ppm.
5) last but not least... Now write down the water volume and the amounts of each additive & keep the notes in a safe place!
It,s easy. Just Shock your pool with a chlorine shock and then make sure the chlorine level is where you need it to be. It, more involved if you go from Chlorine to Bacqucil. but why would you want to Bacqucil is so much nicer and easier.
How much chlorine, shock treatment, and conditioner do we put in an 18ft. x 48in pool? Also, how often does this need to be done?
1/2 a bag OS shock
better to get a bag of shock rather then guess and do it yourself local pool supply should have it
a dollar- that's how much shock for the pool costs
Backwash first then shock. If you shock and then backwash you will be throwing away the shock you just put.
Wait a couple of days and it will dissipate.
Use a chlorine reducing agent. You can get them at the pool supply. One is called After Shock, but there are others.
five pounds
3800 gals of pool water shock it with 1 gal bleach
There is chlorine shock and non chlorine shock. Fo chlorine shock, which is the normal shock, it is the same a s Chlorine but unstabilized, so it will not last in the pool very long.
You do not need to remove it.