Concrete Pools

pool repair underwater

concrete pools require the most maintenance of any type of in-ground pool. You don’t have to worry so much about your calcium levels in vinyl and fibreglass swimming pools but this is a very important factor when having a concrete or tiled pool. Water will leach calcium out of the surface of the pool and the grout lines if there is not enough calcium in the water, it causes further pitting, roughness, falling off tiles. Concrete-, Pebble-, Gunite pools need to be watched closely for cracks or loose areas, in a tiled pool look for missing grout lines and loose tiles, to find areas to be repaired as soon as possible in order to prevent further damages.

The pool water balance is a very important factor too, PH levels need controlled regularly depending on the usage pattern of your pool but at least twice a week in summer and winter!

The good news is that concrete pool repairs can be carried out underwater easily, no matter if it is cracks, loose tiles or mosaics, Pebbles or Gunite just to mention some surface possibilities.

The Idea for the Underwater Magic product range has been developed from the need of attaching tiles to the bottom and steps of a concrete swimming pool underwater.

After years of developing Underwater Magic got launched on the market 7 years ago as the underwater swimming pool solution which last for years and years under the impact of swimming pool chemicals

and is used in more than 70 countries around the world in all kinds of climate.

Since the launch of Underwater Magic adhesive and sealant concrete pool maintenance became so much less difficult and inexpensive that the advantages of a concrete pools are convincing people around the world to go for a concrete pool.

The scientific team of Underwater Magic has carried out tests in all kind of pools due to the need of an underwater repair solution for all kinds of pools and the result is:

Underwater Magic adhesive and sealant can be used for all kinds of swimming pools and sanitizing systems. The scientific team is in constant cooperation with pool building materials and pool chemical manufacturers to make sure all swimming pool types existing and coming can be repaired directly underwater and in wet areas as the permanent solution for pool professionals, maintenance teams for commercial and hotel pools and private pool owners alike.

The 24/ 7 technical support team is the only underwater pool repair support team which is available for all customers around the world free of charge to make sure not a drop of water, time or money is wasted when pool repairs are needed. You can reach our support team here

Water is life and everybody acting responsible and doing the swimming pool repairs underwater is doing a vital part of protecting the environment.

Crack repair in a swimming pool underwater

Ageing, movements of the ground due to pool weight and  earthquakes are only some reasons for a swimming pool shells to crack.

To empty the pool is so expensive and an empty pool can even crack more, what can be done?

Filing and sealing cracks in swimming pools is so easy, all you need is Underwater Magi adhesive and sealant in a matching color a caulking gun for pasty martials,

a kitchen sponge and sand paper.

Step 1. Remove all loose and brittle material together with algae, dirt and grease with the kitchen sponge, use the sandpaper for the inner side of the crack.

Step 2. Apply Underwater Magic adhesive and sealant into the cracked area, press it firmly into the crack to ensure a good bond.

Step 3. Smile you are done with your underwater crack repair    


Underwater Magic earth quake tested underwater repair pool glue

Underwater Magic adhesive and sealant is sealing the crack instantly and it stays flexible to last when you pool shell is moving for whatever reason. It is earthquake tested in a real earthquake of a magnitude of 5.5 on the Richter scale  just 2 KM away from the center of the earthquake and it is a permanent repair solution for all kind of pools including chlorinate swimming pools.  

Which Underwater Magic product do you need for your repair?

The Underwater Magic product range covers almost all kind of swimming pool repairs which can be carried out underwater with longest lasting results in any kind of swimming pool

Underwater Magic adhesive and sealant 290 ml / 600 ml

Underwater Magic adhesive and sealant

is the super strong good father of all swimming pool adhesives.

Repairs and replacements of expansion joints in commercial and private pools are done on a daily bases all around the world.

Re-attaching and replacing tiles of any size including re-doing the grout lines in one step makes it easy to repair even large areas directly underwater

Cracks in the pool shell is often the reason for tiles to come off and the crack repair can be done all in one go tougher with the reattaching of the tiles.

Gunite and Pepple pools are repaired the same way all in one go and fiberglass pool cracks are patched up within minutes. Underwater Magic 290 ml coming in the 5 most common grout line colors is the permanent pool repair solution for all swimming pool types. 

Underwater Magic Mosaic 120 g

 Underwater Magic Mosaic glue 

is everybody’s choice for there-attaching and re-grouting of mosaic tiles of any kind. Pool pros are using Underwater Magic Mosaic also to repair leaks in tight areas and corner, the toothpaste type squeeze tube is just so handy that underwater working in tight areas becomes an easy task. Underwater Magic Mosaic 120g is the ultimate mosaic tile repair adhesive and sealant for permanent underwater repairs.  No tools required!

Underwater Magic Putty 56 g


Is the product made for pipe repairs underwater and in wet areas and recommended for permanent repairs around pipes tubes etc.  It fills cracks an holes and is useable without any tools.

How easy is it to repair a pool underwater?

If you can handle a tooth paste tube and a kitchen sponge you can do many repairs in your swimming pool yourself.

Underwater Magic Mosaic is the product to use to re-attach mosaic tiles back in place directly underwater.


Step 1: clean the area where he tile needs to be glued on with your kitchen sponge

Step 2: clean  the mosaic tile on the back side and edges.

Step 3: apply a bit of Underwater Magic Mosaic on the mosaic

Step 4: press the mosaic tile firmly back in place

Step 5: use a wood pin or even your finger to smoothen the grout line

Step 6: rub away the access glue with the kitchen sponge or finger


That’s it!


Does it last? Yes it will last for many years Underwater Magic Mosaic is made to last in all kinds of swimming pools.


Can I use any underwater glue? NO. Only the Underwater Water Magic products are made for swimming pools which makes sure that repairs last under the influence of pool chemicals and they are the only non-hazardous  products which makes them the safest way to repair a pool yourself.


Why do the others do not last? Pool chemicals are very aggressive to any kind of adhesives and sealants and they dilute all other products in a matter of weeks.


The Underwater magic technic tem is constantly working with the pool chemical manufactures to make sure a repair done with an Underwater Magic product will last for years