Both sides of south side of pool have close to / less than 4 feet.

Pool Surface
The surface is fairly worn, especially seen in the steps. I would estimate the surface is likely 20 to 25 years old with a significant amount of organic matter present on it. On top of that I also see staining, rust colored, mostly in the deep end. It is all likely surface level, but some of them are pretty deep and pronounced. There are easily over 100 rust stains. One or two of them are catching my eye which I initially thought were rebar stains, but it could equally be just a surface stain. Recommend treatments to remove and test to confirm if any of these are rebar related. If they are, recommend attention. But stain treatments would likely run $200-$300, maybe slightly more.
The surface has a fair amount of mottling present essentially over the entire surface for the most part, which is common with age, but otherwise the surface may potentially have another 1 to 10 years of additional life depending on its eventual water loss status, which is not confirmed at this time as I was noticing calcium hardness levels and cyanuric acid levels were low, which is generally indicator of water loss. Again with the pits seen on the steps mostly this may be indicative the plaster is expiring soon or has already expired. Recommend re-checking in 1 to 30 days the water quality to confirm.
Cost summary (this section only)
• Stain treatments and testing: $200–$300 (maybe slightly more)
• No other immediate costs required for the surface itself

Waterline Tile and Rock Features

The waterline tile also appears to be in pretty good condition. The only area of concern that I have is near the skimmer throat between the tiles and the skimmer. It will likely need a very minor application of new mortar for extra waterproofing and there’s also some cracking occurring around the skimmer. This could be brought on by many factors, but it may be wise to just fill it now with some mastic at the same time for less than $500 extra, grind it and fill it so that way it is at least not a trip or injury hazard in the near future, hopefully the next 5 to 10 years.
The waterline tile and raised waterfall and rock features all appear to be original with no apparent updates having been performed on them recently.
The waterfall appears to be in really good condition overall for its age, just like a lot of the rock features on the raised concrete areas. But the mortar is beginning to shrink, which is normal and will need to be redone soon, especially on the concrete rock features as we are seeing some gaps forming and loose mortar. I would give it less than three years up to five years, but likely closer to one to three years it will be needed just to prevent water loss, especially on the waterfall section.
The waterfall section to be re-mortared and re-waterproofed may run from $500 for a low cost over the top application up to $3,000, which would likely include the additional rocks to have them re-mortared and resecured. Some of the decorative rocks, especially on the waterfall, I feel this is gonna be needed as I mentioned in the next 1 to 3 years, hopefully five years or more, especially if the waterfall is not run as often.
Cost summary (this section only)
• Skimmer throat minor mortar and crack repair: <$500
• Waterfall and rock mortar repair/re-waterproofing: $500–$3,000

Water Quality
The water quality appears to be just likely balanced. The chlorine is slightly high, probably between 5 and 10 ppm, closer to 10, for both free and total. The pH and alkalinity are both high. This is indicative of organic matter growing in the pool, which we do see as algae present throughout, especially in the shaded areas and on the west side and facing of steps. I also see it inside the plumbing, which is a strong indicator that it is present throughout and will likely need treatment to remove. The fact that the chlorine level is so high is indicative that we have a pretty prolific algae present. It is likely inside the filter elements. I would estimate $200 to $300 in treatments, maybe more, but also adjustments to the pH and alkalinity maybe $20.
Cost summary (this section only)
• Water treatments for algae and organic matter: $200–$300 (likely $300 or more)
• pH and alkalinity adjustments: ~$20

Skimmer and Main Drain
Skimmer
The skimmer is due to have a new weir door, float, float O-ring and weighted basket along with a new skimmer lid installed, less than $500.
Main Drain
There are two main drains and two wall ports. All four should be updated for safety at around $100 each cover, including parts and labor.
Cost summary (this section only)
• Skimmer component updates (weir door, float, O-ring, weighted basket, lid): <$500
• Update all four main drain / wall port covers: ~$400

Bottom Cleaner
The bottom cleaner is nowhere near like new. In fact it’s probably 5 to 10 years old and in relatively poor condition overall, likely because of how much organic matter it’s forced to endure and pick up. It appears it needs new hoses, hose swivels and a new tail sponge soon. That will probably be between $100-$200 depending on options.
Also the unit itself is around five years old, maybe seven years old, but probably closer to five. All wheels spin and work correctly, but I give it a 5 out of 10 on quality and condition.
Cost summary (this section only)
• New hoses, swivels, and tail sponge: $100–$200

Auto Fill
For an unknown reason, there is no auto fill float present. I cannot imagine why, but it is not present. Additionally, the auto fill shut off valve is older, but in working condition located on the pool equipment pad.
Update the auto fill to have an auto fill float head. The cost of $125 to $250.
Cost summary (this section only)
• Auto fill float head: $125–$250

Pool Light
The pool light appears to be in relatively new condition, but to me it appears there is condensation present inside the light lens. So hopefully this is less than three years old and therefore it should be covered under warranty at no cost. But if it is not, to replace this light with a LED 120 V light would likely cost you around $800-$1,200 depending on model and options and then you’ll pay someone around $400 to install it.
Cost summary (this section only)
• LED 120 V light replacement + install: $1,200–$1,600 (depending on model and options)
• Warranty replacement: $0 (if under 3 years old)

Filter
The filter is original. It is easily 25 years old and heavily sun damaged in condition. This filter in particular is heavily susceptible to sun damage as well as its band. Its band also is heavily corroded.
Additionally, on the top shell and the bottom shell to me it does appear that there are at least two locations where we may be wearing through and water is seeping through this tank, indicating that the tank itself is likely compromised. If that’s the case, the cost for a new filter would likely run between $800 up to $2,800 just depending on options. Plus installation may run around $1,000 including parts and labor.
The filter does look like it has been recently serviced as the pressure also appears to be relatively low, which is generally indicative of new filter elements. If that is the case, expect that the filter may have some remaining life, but with the water loss present, depending on how severe it is, may require the filter itself to be replaced sooner than later, likely less than six months.
Cost summary (this section only)
• New filter + installation: $1,800–$3,800 (depending on options)

Filter Pump
The filter pump is in great working condition for its age. It is older. It is likely 20 to 25 years old, likely closer to 25. Still in ideal working condition. There is little to no wear seen on the motor anywhere, which is fairly remarkable. Everything appears to be in good working condition on it. It has a connected communication cable and its conduit is intact and ideal.
The only issue I see is it doesn’t have its bonding wire connected, which is the only reason why it leads me to believe that this pump may be 10 to 15 years old because it isn’t connected to the original bond. It is currently, but the bonding wire is currently bent back towards the panel and could easily be connected.
The only issue I found is the drain plug O-ring on it is due for service, so I’ll say $50 for that, but everything else is ideal. It even appears to have its original pump lid, which is also remarkable but not uncommon. The pump is also not attached to the ground while the other waterfall original pump is, which is again also leading me to believe this has been an updated pump in some regard. Either way I do like this pump. I hope it lasts another 25 years.
Cost summary (this section only)
• Drain plug O-ring service: ~$50
• Bonding wire connection: minimal cost (easy fix)

Difficult to tell, but it does appear to be a small leak at its drain plug likely just due for minor service ($50).

Waterfall Pump
The waterfall pump is an original pump. It is in relatively poor to damaged condition. It is leaking from its seal plate. It also has a pump lid that has cracked from over tightening and having difficulty removing. The motor is also heavily worn and overall damaged via environmental exposure, especially the salt adding to that decomposition of the motor. But it is bonded by the bonding wire so that is the one good thing.
I would not expect this pump to last too much longer in its current state. Items that need to be updated now are the pump lid and service, which will likely cost $500-$700 depending on issue. If that’s the case, a new pump would likely run between $500-$800 for a low cost pump on Amazon and around $1,000 to install.
Cost summary (this section only)
• Pump lid and service: $500–$700
• New pump + install: $1,500–$1,800 (low cost option)

Board and Timer
The panel is original. It is working. All items on it appear to be functioning.
The only issue I have is it would be ideal to update the breakers to GFCI, updating the variable speed pump to GFCI and the plug to GFCI. There’s a cost around $300 plus $300 in labor so $300 in parts and $300 in labor to update this.
You’re also appears to be a landscape lighting timer box on top and then a Pentair IntelliChlor chlorine generator on the rear of the panel that appears to be functioning at this time.
Cost summary (this section only)
• GFCI breaker updates (parts and labor): ~$600

Salt Cell
The salt cell is an IntelliChlor Pentair that appears to all be in working condition. However note that the cell is approximately 6 1/2 years old and typically the maximum life expectancy of these units is around seven years so a new salt cell at around $950 is likely going to be due in the next 1 to 24 months.
Cost summary (this section only)
• New salt cell: ~$950 (due in 1–24 months)

Valving and Plumbing
The valving present is likely all original. There is only one valve and one check valve and the rest of the plumbing appears to be leak free.
I would recommend service to the three-way valve and the check valve for around $500 or less, including parts and labor. But it may be wise to just simply reroute the pool pump plumbing after the filter to function the waterfall without the need for this second pump. That modification would likely run $500 to $1,000 depending on options and I would highly recommend that versus using a second pump for the waterfall in the future. You can always add automation.
Overall the equipment pad also needs to be repainted and re-labeled around $300+ and UV mesh for around $50 to block the sun and limit UV degradation and sun exposure.
Cost summary (this section only)
• Three-way valve and check valve service: ~$500 or less
• Reroute plumbing for waterfall (recommended): $500–$1,000
• Repaint and re-label equipment pad: ~$300
• UV mesh: ~$50