The surface is pretty much dead. While it could be cleaned and filled, it will never look “clean” ever again. It is missing a significant amount of its surface. Not to mention, there is significant discoloration present likely from over chemical treatments and high-pressure spray washing.

There are likely to best options, one being painting the surface $1500+/-, which I do not recommend as a long-term solution but instead a low-cost solution. The surface will look amazing for less than one year. And likely will survive after five years. Alternatively, replastering the pool is a best overall option where you can replaster a pool this size for between six to $12,000.

While the pool is empty, it is best to work on the coping or tile at that time. On the north east corner of the pool some of the concrete around the coping is lifting, causing the coping to crack. He’s cracked areas and lifting concrete could simply be grinded / filled in new to a level so there was no longer a trip hazard ($500-1500). Otherwise, the rest of the pools coping and concrete is nearly even with one another.

The skimmer throat and some small sections and around the pool above the tile will need some new mortar added this is less than $10 in product or a $500 service call.

It does appear that there is a calcium build type Present and Likely some additional build up type Present which may be a stain. If these materials can be removed I would expect a cost of approximately $650 - $900 for a tile technician to remove it via a glass bead blasting service.

The pool has significant landscape debris around it and in it, it would be VERY wise to trim a considerable amount of this landscape debris away from hanging over this pool as a long-term solution $1500+ as I would nearly guarantee the real cause as to why the surface looks so poor, are these exact trees, and their foliage that drops…, But to simply clean this pool so it can be filled and used as is, I would expect approximately a $300 service call.

Cannot see main drain cover(s).

Debris in skimmer / older skimmer

Recommend at minimum a new float / float o ring / weir / basket weighted , lid ($650).

There is a manual fill line that is leaking your news recommend repair ($250+).

Older smaller swim quip ($550+ install)

This filter has its is element set aside with its , stand pipe air bleed hose - I recommend a need a new tank O-ring, and pressure gauge and element ($350+).

Pentair Element

This is the most ideal motor size for the current plumbing. Recommend bonding this pump if available or possible ($150+).

The pump does turn on and operate however, it is likely that the pump Lid o ring and possibly the seal plate and or shaft seal. O-ring will need to be updated in the next few years ($500+).

The booster pump is no longer connected to the pool which may be due to an abandonment of that line.

But because this is the most crucial need of this pool; foliage collection for removal , it should be investigated if desiring a long term solution. If not $100 bottom cleaner in the skimmer as a C- solution.

A new ideal cleaner is $650 Polaris 280 / 380 and a new booster pump ($950+) Pentair BoostRite

There is a heater present here, but it is not connected to anything, and therefore unknown. The new heater install is typically $3800+ Plus running a new gas line which will likely be required $1500+

The electric panels are older than 25 - 35 years on one timer and five years on the other. I do feel that this electric area is safe, likely due to rotting of metal conduit, to someone experienced this can be cleaned up for less than $300-500 / or simply minimizing what’s here ($100-300). These conduits are the only thing being used to secure these older timers / electrical lines. This area may require some proper mounting and restructuring the metal conduit lines as well as a new electric access panel for proper space for GFCI for both pool pumps but lights etc ($500+-1000+) or simplifying for $100-300 in parts.

Similar to seeing old seashells at the bottom of the ocean floor, we are seeing an old booster pump that was once connected here left a portion of its skeleton remains.

Because this is copper, you have copper to PVC connections. These connections should be serviced every 10 to 20 years ($300 each x2) that will likely be needed and if that doesn’t solve all issues a new connection will need to be installed ($350 x2).

Otherwise, the other plumbing present is in fair condition, but most of it was installed with blue glue. Recommend updating the Plumbing area with proper purple and gray in the next 10 years ($750).

Equipment pad should be painted labeled and covered from UV ($400+).