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I am not the most knowledgeable guy on these issues, but I will try to answer. We have tables and computers to calculate mandatory decompression stops. More dives is of course more risky, as there are bubble dynamics that are included in some models and not in others and the topic is...

A new mask might cost less than all these cleaning attempts. I do carry two masks, btw.

A single HP100 will not be enough if you want to spend any time down there at 120 feet. You would want two (you need to have contingency gas, remember). This means that you will want either a backplate that can be upgraded to carry doubles (and a new wing) or you start diving sidemounted...

Pressure vessels require regular inspections. There are two types of inspections: visual inspections (someone certified looks into the cylinder) hydrostatic pressure tests to see if the cylinder has kept its elasticity; if it stretches and does not revert to original dimensions, there is a...

Be careful with the frame though! You'll only want to work the glass.

I do not know what those deposits are. Could they be calcium? You have tried baking soda (sodium bicarbonate) with pH 8.3 = alkaline How about vinegar, pH 3 = acidic? Or lemon juice? Note that "To remove calcium deposits, use an acid-based cleaner like white vinegar to dissolve them, or use a...

Nitrogen loading is a physical process. It does not ask your age. Offgassing is another. If the dive has been deep enough for the nitrogen to enter bubbles in the blood stream upon ascent, then blood flow may be hampered locally bubbles may cause an inflammation, hence see #1 These will cause...

That's a nice amount of dives for the first year (or less). Nice You spent 110 bar in five minutes??? Something does not add up. Anyway, you are out of air. It has happened to me too, once unplanned at 60 ft. Nice I have done the same thing myself, and it was not a wise choice. What if you...

Some people think that the dive ends at 18 feet. It does not, however. The shallow stops can be great for many reasons: Sunshine, finally. Plants and fish to be seen. All the extra time spent at 15 or 9 feet is still diving. Buoyancy control skill grows fastest in the shallows. I feel much...

Your dive guide said it is perfectly safe for him/her. So, maybe it is. However... Have you been drinking enough water during the week prior to diving? Sun bathing? Drinking alcohol? Dehydrated for some other reason? Are you fat, in bad physical shape, old, or with a PFO? When did you last...

Apeks Comfobite is good.

It's hard to find modern depth gauges that would be limited to shallow depths. Here are two that reserve more space for the shallow depth values: https://www.paragondivestore.com/products/oceanic-maxview-depth-gauge...

Diving logs are boring. I keep a diving diary with pictures instead. Sure, it contains times, depths, profiles, gases etc. but it also contains written descriptions of the dives. It is not just a log, it is a diary with photos and all. I do keep digital diving logs but the diary is strictly...

If you find small size beneficial, then sure, use it, but also get used to folding it out eyes closed. There are many choices to make in diving and each one comes with both benefits and drawbacks.

Too many moving parts. If you are in trouble, you don't want to start solving a puzzle.

Get a silver colored permanent marker and write your name or a symbol of your choise on your fins. This, obviously, works best with black fins. Put reflective tape on your cylinder. Get some colorful hoses: Miflexhoses | Miflex Scuba Hose | Miflex Regulator Hose And then... I'm sure no-one...

It could be 18 pounds, still.

It's also a great app.

Punctured gloves should be quite rare but badly sealed ones are not. Flooded drysuit gloves become quite cold after some time (now, some people, like me, wear merino wool gloves and wet mittens without feeling cold, but exposure is limited in these cases). Your drysuit does not flood though...

I assume you mean latex wrist seals. They are convenient when changing to wet gloves/mittens or diving with bare hands. They however impact the air flow and may make your fingers colder than needed, when wearing dry gloves in icy waters. You need to choose between ease and comfort with...