My pool is around 24 thousand gallons, chlorine and electricity ( running the pump average 3 to 4 hours a day) runs around P3,500 per month. Labor for maintence is done in house so no labor costs. From time to time cleaning equipment will need replacing and pump house problems can spring up. If you develope an Algie problem my guess you would be looking around P2,000 for additional chemicals/shock treatment.
My biggest expense is food and drinks for all the people that show up for a swim... HaaHaa.

 

It all depends on ; sun exposure, depth, water quality, tree's in the surroundings, cleanliness of , and amount of users. We have our rain water pool now 12 year , it is about 10,000 gallons, 4 ft deep overall and roofed!
My wife and me use the pool at least one/two times a day, after showering!
Cost 4 kg chlorine 90 =P 1,200, 2 kg anti algae P 700 in 3 months = appr. P 500 per month . Vacuum ones every 2 weeks, run pump ones a week for 3 hours . Remove leaves ect daily from surface and bottom using the net what comes with the equipment but the netting replaced with a finer screen...Water is always crystal clear.

 

We use a pool maintenance service (Tropics Pools and Gardens). They come twice a week for 2 to 3 hours and do cleaning, vacuuming, water quality testing, adding of chlorine/algae/ph chemicals, inspection of pump and filter system. Cost is 3200 pesos per month. It's difficult to know exactly what the electric cost is, we do run our pump at least a couple of hours everyday, often all day, and I would guess that it is about 2000 peso per month.

 

Our 75sqm swimming pool monthly cost 6,000 to 7,000 per month plus labor of 4 times per week(1,600) total per month is 8,500 pesos more or less. All includes; chemicals, electric, equipment replacement and labor.

 

Polaris have salt water chlorinators for sale, don't know prices as I imported mine from Australia over 20 years ago, which is still working well. Structural pool construction is the same for both fresh & salt water pools, only the plumbing in the pump room is slightly different.

 

I have a property with a pool, but use salt water chlorination, so a sack of salt can last up to a month or two, depending on usage(P200/40 kg sack), algaecide( copper sulphate) runs to about P350/kg, we use a 1/4 kg every fortnight(two weeks). Chlorine dependent on whether you use 70% or 90% ( P250-P350/kg), as we use very little powdered chlorine, probably lasts around 1-2 months/kg. Of course you need electricity to run the pumps every day, so that would also increase the cost and a test kit for a weekly water testing.