If it's still green, then a 10L jug of liquid chlorine is a good idea. What is its concentration--6%, 10% or 12%?
I estimate your pool volume at closer to 65,000 liters, assuming a 4' depth. Even if the water if 5' deep your volume is 81-82000 liters.
Still the chlorine rule of thumb works for liters just as well as gallons:
1 liter of chlorine at 5.25% will add 5.25ppm to 10,000 liters of water. If you have 65,000 liters, you need 6.5 liters of chlorine to get the same level.
If your chlorine is 12%, 6.5 liters of chlorine will give you 12 ppm and 3 liters will give you 5.5ppm.
I suggest you do your main reading here and not at commercial sites. The chemical and pool store sites will give you erroneous information.
You really need to learn about the B-B-B method of pool maintenance, which stands for Bleach, Borax and Baking Soda--3 chemicals you do NOT need to buy in a pool store. Combined with Muriatic Acid (from hardware stores) the only chemicals you buy from a pool store are stabilizer and PolyQuat-type algaecide (never use any other algaecide).
It's actually all very simple. You are going to aim to keep your chlorine levels as a sanitary level, and your pH in the 7.2-7.8 range. Every other chemical is to help do that.
As for filling your vacuum hose: Hold it to the return opening from the pump that's in the pool rather than a garden hose. It has a much higher pressure and volume and will blow the air out of the hose--and will already be in the pool and under water. You'll SEE the air come out and the hose will sink!
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