Dear Sam

Thank you for showing interest in my Liquid Gypsum project and spending time researching it yourself. The following is a result of my own research and experiments carried out under laborartory conditions (in my kitchen!).

Introduction

Over Christmas I became aware of Gypsum being a solution for clay soil based lawns which retain water, causing water logging. Standing water on lawns deprives grass roots of air, the roots are unable to grow deeply and may rot.

Gypsum is used in agriculture to break up compacted clay soils as it eliminates the need to mechanically plough, saving much time and costs for the farmer. The success of crop production is greatly enhanced. This is also good for the environment as less fuel is used by their tractors and machinery.

However, I was sceptical about the whole concept as adding liquid to a water logged lawn seemed counter intuitive.

The Results of my Research

Clay is made up of very tiny particles and they are flat but wide, a bit like a 50 pence piece. The flat surface is negatively charged and so when stacked up on each other (as in soil) they repel each other (called dispersion). With water between them they become ‘sticky’ and slide over each other. Gypsum is a mineral made up of Calcium with a positive charge. When added to the clay a reaction occurs called Floccualation. The Calcium causes the sides of the 50 pence pieces to become positively charged (coloured red in the second image below). As opposite electric charges are pulled towards one another by electrostaic force, then the clay particles behave differently. They actually clump together in a random way producing voids between the clay particles. The voids allow water to drain out of the clay, encouraging air circulation and grass roots to penetrate through – leading to healthier grass plants.

I mocked up some ‘clay particles’ to show the process of Flocculation out of cardboard as I wanted to demonstrate it to my Wife, Mother in Law and Uncle in an simple way.

A more scientific image of the Flocculation procees is below;

Experimentation

I needed to test this in my kitchen ‘laboratory’. I collected a lump of clay from your estate where construction is still underway. I put 5 grams in one test tube (gypsum tube) and another 5 grams in a second test tube (control tube). I then added 20 ml of rainwater & Gypsum to the ‘gypsum tube’ and just rainwater to the ‘control tube’. Both were shaken vigourously.

Immediatley the water in the tubes changed with the ‘gypsum tube’ rainwater being almost clear. The rainwater in the ‘control tube’ was brown as the clay was being held in suspension. The image below shows this. However, I could only conclude that something significant had happened. between the tubes.

I left the tubes for 24 hours and then poured the contents into two separate cups using kitchen towels as filters to see what happened. The ‘gypsum tube’ contents drained through the kitchen towel immediately. The ‘control tube’ contents didn’t drain much as you will see in the images below. The rainwater of the ‘control tube’ puddled.

Now for the best part. Once fully drained, after another 24 hours, I emptied the remaining clay from both tubes onto a fresh kitchen towel, as you will see in the image below.

The clay from the ‘gypsum tube’ was relatively dry and I could pick it up in my fingers. The clay from the ‘control tube’ was still very wet and sticky. I was not able to pick it up in my fingers. The white spots from the ‘control tube’ is water reflecting in my kitchen lights.

I believe that this is conclusive in that Flocculation has occured in the ‘gypsum tube’ and has made the clay particles clump together and therefore more porous, due to the adddition of the Calcium in the Gypsum.

How Your Lawn Starts its Life

We know that lawns on your estate are not given the best start in life,. Clay is the underlying soil structure and is revealed when the developer scrapes off the top soil on day one. They needed to build your house with heavy machinery and storage of materials such as bricks etc. Here are some images of how a new build lawn starts life out on your estate, taken on the 5th January 2026. The clay is further compacted by all of the weight that is has put upon it my machines and building materials.

My Conclusion & The Way Forward

I can conclude that Gypsum changes the composition of clay under ‘labororatory’ conditions. Flocculation has occurred in my experiment.

However, I need to test this in real life or ‘in the field’. I must thank you for allowing me to experiment on your lawns at no charge to yourself.

I have requested to join your housing estate Facebook page. If I can prove that the experiment works on your lawn then I would propose to promote my services for the Gypsum treatment and my annual lawn care services. You will be heavily rewarded if I can get lots of new customers by way of giving you free treatments going forwards.

May I thank you again for your interest and I would ask if you and your husband now understand Flocculation from what I have stated and demonstrated above. I am really asking if you think that the information provided would pursuade residents on your estate to instruct me to care for their own lawns. I look forward to receiving your thoughts.

Mark