Water Purification- Waterwel related

[Kakricas]

Happy Saturday!

Starting from 1 st of August i have rented for 9 years a very well located guesthouse/hostel with 12 rooms and 24 bed dorm in Patong. I am currently getting quotes and offers to make a major renovation. All are going well on generating 3 different quotes for the job being done. My  concern is related to the water purification-waterwell. Currently there is a mazuma filter in the roof and 3 different tanks. The filter is not working properly and as per my information and understanding the previous owner was not servicing at all the waterwell and the filter. He was using both the government and waterwell water. During high season when the government restricts the consumption the majority of the waterwell water is being used and this is when the problem starts. The water is smelly and yellow.I have been to Homepro and Beyong, they have suggested mazuma both but the engineering is asking 25.000baht. I am ok to spend this amount ONLY if there is no alternative option. Do you know anyone reliable water engineering/mechanic or how it is called to come and review the current condition and suggest the best possible option?The current filter is a mazuma one, kindly check the photo in the link.

 

https://photos.app.goo.gl/VviCiRK5aYW7PGsA9

 

Cheers for the assistance.